Axial length eye. Medical search. Frequent questions

Intraoperative aberrometry, which relies not on keratometric power but rather on the total refractive error of the eye, is a good option for determining IOL power in post-LVC eyes. (aao.org)
Refractive error was measured annually by cycloplegic autorefraction and axial length by A-Scan ultrasonography. (nih.gov)
Myopia for each child was defined as the mean spherical equivalent refractive error (SER) of the 2 eyes. (nih.gov)
Genome-wide association meta-analysis of corneal curvature identifies novel loci and shared genetic influences across axial length and refractive error. (ox.ac.uk)
The spherical equivalent refractive error of the myopic eye was between -5.0D and -12.0D. Fourteen subjects were successfully fitted with the RCL, and nine subjects (control group) used a spectacle lens. (constantcontact.com)
Overview of Refractive Error In the emmetropic (normally refracted) eye, entering light rays are focused on the retina by the cornea and the lens, creating a sharp image that is transmitted to the brain. (msdmanuals.com)
More commonly, refractive error is measured with a standard phoropter or an automated refractor (a device that measures changes in light projected and reflected by the patient's eye). (msdmanuals.com)

Purpose: Previous studies have suggested that ocular axial elongation may be caused by an equatorial production and elongation of Brunch's membrane and may be triggered by messenger molecules directed to the equatorial retinal pigment epithelium (RPE). (arvojournals.org)
In the animals without lens-induced myopia, the right eyes with amphiregulin antibody application (20µg) showed a reduced axial elongation ( P =0.04), and the right eyes with amphiregulin injections experienced an increased ( P =0.02) axial elongation in a dose-dependent manner (1ng:0.04±0.06mm;10ng:0.10±0.05mm;20ng:0.11±0.06mm). (arvojournals.org)
Eyes with lens-induced axial elongation as compared to eyes without lens-induced axial elongation revealed an increased visualization of amphiregulin upon immunohistochemistry and a higher expression of mRNA of endogenous amphiregulin and epidermal growth factor receptor, in particular in the outer part of the retinal inner nuclear layer and in the RPE. (arvojournals.org)
Conclusions: Amphiregulin may be associated with the process of axial elongation in young guinea pigs. (arvojournals.org)
Wearing spectacle lenses with aspherical lenslets for 2 years can inhibit the thinning of the choroid and slow down axial length elongation with a dose-dependent effect. (bmj.com)
Some identified variants showed precise scaling in corneal curvature and eye elongation (i.e. axial length) to maintain eyes in emmetropia (i.e. (ox.ac.uk)
others exhibited association with myopia with little pleiotropic effects on eye elongation. (ox.ac.uk)
Use of low-dose atropine eyedrops (concentration 0.01%) was no better than placebo at slowing myopia (nearsightedness) progression and elongation of the eye among children treated for two years, according to a randomized controlled trial conducted by the Pediatric Eye Disease Investigator Group (PEDIG) and funded by the National Eye Institute (NEI). (scitechdaily.com)
Various interventions have been shown to slow axial elongation in children. (constantcontact.com)
In a study by Michael Lipson et al, these interventions were evaluated to assess efficacy in slowing axial elongation, correction of vision, and the related quality of vision, risk of adverse events, overall safety, but also the overall impact on vision-related quality of life (VR-QoL). (constantcontact.com)
In another paper, by the same lead author, in Eye & Contact Lens - the role of ortho-k specifically to slow axial elongation and progressing degree of myopia is explored. (constantcontact.com)
Children undergoing ortho-k have shown significant slowing of axial elongation and myopia progression. (constantcontact.com)
This review presents data on the efficacy, benefits, and risks of the use of ortho-k to slow axial elongation in myopic children. (constantcontact.com)
With precise fitting, careful follow-up, and patient compliance with recommended lens cleaning and disinfection, ortho-k may be considered a safe and effective method to slow axial elongation in children, according to the author - but these terms may be as important as the end result itself. (constantcontact.com)
Does axial elongation increase when ortho-k is discontinued? (iacle.org)
This single-masked, prospective study was conducted by Cho & Cheung to evaluate changes in axial elongation, over a 14-month period, in subjects who discontinued (for 7 months) and then resumed orthokeratology lens wear. (iacle.org)
Significant increase in axial elongation was found in subjects when they discontinued lens wear. (iacle.org)

Therefore, eyes evolved in water have a mechanism involving changing the distance between a rigid rounder more refractive lens and the retina using less uniform muscles rather than subtly changing the shape of the lens itself using circularly arranged muscles. (wikipedia.org)
The highly vascular choroid, located between the retinal pigment epithelium and the sclera, supplies oxygen and nutrients to the outer retina and plays an essential role in vision-guided eye growth. (bmj.com)
Ocular refraction is defined as the ability of the eye to bend light rays to focus them on the retina. (medscape.com)
The patented Cornea-to-Retina Scan allows you to detect unusual eye geometries, such as tilt or decentration of the crystalline lens. (zeiss.com)
1 2 Myopia is a refractive defect of the eye that causes light to focus in front of, rather than on, the retina, usually because the axial length of the eye is too long. (bmj.com)

Purpose: To investigate the influence of monocular defocus upon the diurnal rhythms of axial length and intraocular pressure (IOP) in human subjects. (edu.au)
Figure 7-2 Accuracy range of commonly used intraocular lens (IOL) calculation formulas by axial length. (aao.org)
To compare the effect of spherical aberration on optical quality in eyes with two different aspherical intraocular lenses. (hindawi.com)
pathways of intraocular pressure (IOP) release by the various structures of the eye. (constantcontact.com)
The sound velocity through the aphakic eye is 1532 m/s, and the velocity through the pseudophakic eye is 1532 m/s plus the correction factor for the intraocular lens (IOL) material. (medscape.com)

Myopic foveoschisis (MF) is one of the major causes of vision reduction in myopic patients, and its presence has been increasingly recognized with the advent of optical coherence tomography (OCT). 1 , 2 The estimated incidence of MF ranges from 8%-34% in eyes with high myopia. (dovepress.com)
The symptoms of myopia can be alleviated with spectacles, contact lenses, or refractive surgery, but irrespective of visual correction, the risk of complications from potentially blinding conditions such as retinal detachment, glaucoma, and myopic maculopathy, increase with the longer axial lengths associated with high myopia. (bmj.com)

Full eye examination was performed including ultrasound biometry to assess the axial length. (heraldopenaccess.us)
For each test person the following examinations were performed: Best corrected visual acuity using an ETDRS visual acuity chart at four meters, autorefraction in cycloplegia (cyclogyl 1%), full slit-lamp examination, indirect stereoscopic ophthalmoscopy with a 90 D lens, applanation tonometry and ultrasound biometry in order to determine the axial length. (heraldopenaccess.us)
IOLMaster 700 from ZEISS provides this planning solution with biometry measurements and three imaging reports: an OCT scan to screen for pathology and anatomical anomalies, a reference image for intraoperative guidance with ZEISS CALLISTO eye, and a SWEPT-source OCT analysis of the posterior cornea for Total Keratometry (TK) corneal astigmatism measurements. (zeiss.com)
Biometry measurements, including axial length and epithelial maps, can be undertaken with the device. (aop.org.uk)

Generally mammals, birds and reptiles living in air vary their eyes' optical power by subtly and precisely changing the shape of the elastic lens using the ciliary body. (wikipedia.org)
As previously mentioned, determining the central keratometric power, a key element in lens power calculations, is complicated in eyes that have undergone previous refractive surgery because of the corneal change resulting from the original refractive procedure. (aao.org)
The cornea, the lens, and the axial length of the eye are the main contributors to the eye's refraction capability. (medscape.com)
If lens deposits occur (in poorly blinking eyes), a hybrid contact lens (soft periphery, rigid center) can provide a clear visual axis. (masseyeandear.org)
ZEISS VERACITY Surgery Planner also incorporates topography maps and keratometry data like axial length, anterior chamber depth, lens thickness, white-to-white, and more. (zeiss.com)
In other words, even if there is such an increase due to the scleral lens, the eye may adapt to it. (constantcontact.com)
In some of the larger scleral lens practices in the world, scleral lens management for dry eye can be as much as 50% of the indication range, as Muriel Schornack from the Mayo clinic in Rochester (US) indicated. (constantcontact.com)
Our aim is to help you keep up to date with the latest contact lens and anterior eye research, and to locate articles when you want to know more about a particular topic. (iacle.org)
Eye & Contact Lens 2017;43:3 141-154. (iacle.org)
Stopping ortho-k lens wear at or before the age of 14 years led to a more rapid increase in axial length that slowed again with resumed lens wear after 6 months. (iacle.org)
Cont Lens Anterior Eye 2017;40:2 82-87. (iacle.org)
An interface is the junction between any two media of different densities and velocities, which, in the eye, include the anterior corneal surface, the aqueous/anterior lens surface, the posterior lens capsule/anterior vitreous, the posterior vitreous/retinal surface, and the choroid/anterior scleral surface. (medscape.com)

AIM To compare the axial eye length growth of the two fellow eyes within one patient after unilateral paediatric cataract surgery and to assess changes in refraction and keratometry. (eyehospital.nl)
The axial eye length, spherical equivalent refraction and keratometry were measured during surgery and at follow-up. (eyehospital.nl)
A larger myopic shift (p=3.85x10(-5)) and a larger change in keratometry (p=0.02) were found in the operated eyes. (eyehospital.nl)
Pearson correlation showed excellent correlation for axial length, anterior chamber depth and keratometry among the 3 devices tested. (open.ac.uk)

A two-year randomized controlled trial conducted by the Pediatric Eye Disease Investigator Group (PEDIG), funded by the National Eye Institute (NEI), found that low-dose atropine eyedrops (0.01% concentration) were not more effective than placebo in slowing myopia progression in children. (scitechdaily.com)
Much stronger concentrations of atropine eyedrops (0.5-1.0%) have long been used by pediatric eye doctors to slow myopia progression. (scitechdaily.com)

Changing the axial length of the eyeball. (wikipedia.org)
In particular, the SLITRK6 protein influences the length of the eyeball (axial length), which affects whether a person will be nearsighted or farsighted, or will have normal vision. (medlineplus.gov)

No statistically significant difference in the rate of axial growth between the two eyes was found (p=0.25). (eyehospital.nl)
In group 2 no statistically significant differences were found between the two eyes. (eyehospital.nl)
CONCLUSION We did not find a statistically significant difference in axial length growth between the operated eyes and fellow non-operated eyes in our unilateral paediatric cataract patients. (eyehospital.nl)
Vehicle-injected goggled eyes developed significant FDM. (nih.gov)
The introduction of myopic defocus in the myopic children for a short time resulted in a significant thickening of choroid thickness and shortening of axial length, but the changes restored after removal of defocus. (bmj.com)
Differences especially in measurement of axial length were statistically but not clinically significant. (open.ac.uk)
Nor were there significant differences in axial length within the two groups when compared with baseline measurements. (scitechdaily.com)

o Achieve at least 0.10 logMAR in each eye at 6 m and binocularly at 40 cm while wearing subjective distance refraction. (who.int)
EQUALITY study participants received a comprehensive eye exam by an optometrist including medical history, visual acuity with walk-in and best correction, refraction, color vision, applanation tonometry, pachymetry, undilated slit lamp anterior segment examination, undilated gonioscopy, and dilated fundus examination. (cdc.gov)

Since its introduction, LASIK has been associated with various complications, specifically when performed on eyes with decreased corneal thickness, irregular astigmatism, dryness, preexisting ocular surface disease, or glaucoma, to the point where several of these entities have become relative contraindications to performing LASIK. (medscape.com)

The longer myopic eye has a longer centre-to-centre distance compared to shorter eyes. (heraldopenaccess.us)
In order to activate the same number of cones during steady fixation, the fixational eye movements should, in theory, move the object of interest across a larger retinal area in the myopic eye compared to the hypermetropic eye. (heraldopenaccess.us)
Vision scientists may help us figure out what's different about the myopic eye, even among different races and ethnicities, to help create new treatment strategies," she said. (scitechdaily.com)

For these reasons, retinal surgeons are especially careful performing PPV in older patients, 7,8 in those with a high degree of preoperative nuclear sclerosis 9 or diabetic retinopathy, 2 and in eyes in which silicone oil injection was previously performed, 10 as all are risk factors for the development or progression of cataract. (crstodayeurope.com)
A study by the Pediatric Eye Disease Investigator Group found that low-dose atropine eyedrops (0.01%) were no more effective than placebo in slowing the progression of myopia (nearsightedness) in children over two years. (scitechdaily.com)

RESULTS In group 1 the absolute growth (mm) of the operated eyes was borderline statistically significantly less than in the fellow non-operated eyes (p=0.049). (eyehospital.nl)

An ophthalmic specialist (FM) performed all eye examinations. (heraldopenaccess.us)

The delegates at the meeting pretty much unanimously agreed that we need to talk to other practitioners, both in and outside of the eyecare field, to explain what scleral lenses can do for dry eye patients, as they can potentially change lives. (constantcontact.com)
Scleral lenses can be an ally in dry eye management. (constantcontact.com)

12 % (p = 0.04) in post-myopic LASIK eyes 1 . (zeiss.com)
If one were to consider 1641 m/s at about 0.5 mm, only 0.04 mm would need to be added to the total eye length, which in no way alters the IOL calculation. (medscape.com)

Interventions: Postnatal foot lengths (FL) were measured with Vernier digital calliper in millimetres. (bvsalud.org)

It is difficult to assess IOP in KPro eyes, and finger palpation is the only available method. (masseyeandear.org)

In vivo measurements of the foveal cone density by adaptive optics have shown the cone centre-to-centre distance to be related to the axial length of the eye [20]. (heraldopenaccess.us)

the greatest challenges occur in postrefractive patients or patients with axial myopia or axial hyperopia. (aao.org)
It was first used by Tomes in 1848 1 and refers to an angulation that may occur anywhere along the length of the tooth, that is, its crown, amelocemental junction, along the root, or by only involving the apex of the root 1-2 . (bvsalud.org)

Indeed, the list of benefits is quite impressive and includes brain, digestive and eye health along with positive influences in the areas of asthma and overall lung function, colds and flu, and women's health. (totalhealthmagazine.com)

The question whether correction of the total SA of the eye or some residual SA leads to better visual outcome and better optical quality remains to be elucidated. (hindawi.com)

It is known that healthy young eyes with good visual acuity have some positive ocular SA [ 6 ]. (hindawi.com)
Visual acuity in each eye is tested as the opposite eye is covered with a solid object (not the patient's fingers, which may separate during testing). (msdmanuals.com)

PATIENTS/METHODS A retrospective study in 90 eyes of 45 patients was performed. (eyehospital.nl)
Methods Thirty patients with TAO (60 eyes) and 38 healthy controls (67 eyes) in Shanghai, China, were recruited for this study. (bmj.com)

Calculating the IOL power for eyes that have undergone refractive surgery can present problems for both patients and surgeons. (aao.org)
120 eyes of 60 patients underwent phacoemulsification. (hindawi.com)
Eyes of cataract patients were examined with a functional prototype of the new optical low-coherence reflectometry (OLCR) biometer OA-2000, the standard OLCR biometer Lenstar, and the partial coherence interferometry (PCI) biometer IOLMaster. (open.ac.uk)
A total of 138 eyes of 74 cataract patients were examined. (open.ac.uk)
The medical records of 40 eyes of 36 patients that had undergone 25-gauge vitrectomy with internal limiting membrane peeling for MF were studied. (dovepress.com)
This was a retrospective study of 40 eyes in 36 consecutive patients who underwent the 25-gauge vitrectomy for MF at the Kansai Medical University Takii Hospital (Osaka, Japan) between January 2007 and April 2013. (dovepress.com)
We can be an ally for dry eye patients. (constantcontact.com)
In this systematic review to determine the effectiveness of corneal collagen cross-linking (CXL) in children, McAnena et al analyzed 13 papers, examining 490 eyes of 401 patients with a mean age of 15.25 (+1.5) years. (iacle.org)
To validate their observation that sleep position in some cases may significantly affect dry eye and meibomian gland dysfunction (MGD), Alevi et al conducted this cross-sectional, non-interventional, single-masked study involving 100 study patients and 25 in a control group. (iacle.org)
Patients look at an eye chart 20 ft (6 m) away. (msdmanuals.com)
The onset of the ophthalmopathy is in aimed to investigate the prevalence and most cases concomitant with the onset severity of ophthalmopathy in Graves of hyperthyroidism, but eye disease may patients in our area (north-east of the precede or follow hyperthyroidism [ 3 ]. (who.int)

R = 0.54, p = 0.02 for left eyes). (heraldopenaccess.us)

The small difference in refractive index between water and the hydrated cornea means fish and amphibians need to bend the light more using the internal structures of the eye. (wikipedia.org)

Equatorial diameter, wet weight, and metrics of control eyes were not affected by any treatment. (nih.gov)

To investigate the relationship between the axial length of the human eye and the size of the Retinal Area of Fixation (RAF) in normal test persons. (heraldopenaccess.us)
Callosal Fiber Length Scales with Brain Size According to Functional Lateralization, Evolution, and Development. (harvard.edu)
Using immersion method we obtained about twotimes enlargement of isoplanatic patch size for the developed eye models. (spie.org)
Our study provides insights into population-specific novel genes for corneal curvature, and their pleiotropic effect in regulating eye size or conferring susceptibility to myopia. (ox.ac.uk)

Congenital Zika syndrome is a recently recognized pattern of congenital anomalies associated with Zika virus infection during pregnancy that includes microcephaly, intracranial calcifications or other brain anomalies, or eye anomalies, among others ( 2 ). (cdc.gov)

Knowing that ametropia is strongly correlated to axial length, the present study was designed to investigate if the fixation area and the mean microsaccadic amplitude are related to axial length and ametropia in the human eye. (heraldopenaccess.us)
Thus, the purpose of this study was to report the surgical outcomes of 25-gauge vitrectomy in eyes of MF. (dovepress.com)
Study participants, their parents, and the eye care providers were masked to the group assignments. (scitechdaily.com)
We include a study that tests the hypothesis that sleep position may affect dry eye and meibomian gland dysfunction. (iacle.org)
The primary endpoint of the study is the number of ECMO-free days until day 28, defined as the length of time (in days) from successful libration from V-V ECMO to day 28. (bvsalud.org)
This cross-sectional study utilized SDOCT data obtained as part of the Eye Care Quality and Accessibility Improvement in the Community (EQUALITY) demonstration telemedicine program. (cdc.gov)

We obtained six photos of the right eye of each patient using fundus photography. (bmj.com)
Utilization by patient and hospital the average length of stay was 6.0 days. (cdc.gov)

The secondary endpoints are mortality on day 28, in-hospital mortality on day 60, ventilator-free days during the first 60 days and length of ICU stay. (bvsalud.org)

Individuals with long eyes were found to use a larger retinal area during fixation compared to short-eyed individuals. (heraldopenaccess.us)

The first company to license technologies from OSU, OcuDoc, Inc., is developing new, patented ways to estimate a patient's glasses prescription and also measure eye alignment with a smart phone. (osu.edu)

Despite advances in volume acquisition speed with FD-OCT, eye/head motion artifacts can be still seen on acquired data. (spie.org)

Even instillation of mydriatics prior to cataract surgery fails to dilate postvitrectomy eyes in some cases (Figure 3). (crstodayeurope.com)

To report the surgical outcomes of 25-gauge vitrectomy in eyes with myopic foveoschisis (MF). (dovepress.com)
We recommend that 25-gauge vitrectomy be used to treat eyes with MF. (dovepress.com)

Borderline/outside-reference-range results in the right eye (yellow/red), and within-reference-range/borderline results for the left eye are shown. (aao.org)

Regionally, the mean BMO-MRW was lower in the crude model among AD eyes in the temporal, superotemporal, and nasal regions and higher in the inferotemporal, superonasal, and inferonasal regions. (cdc.gov)

SDOCT scans from 269 eyes (148 participants) were included in the analysis. (cdc.gov)

Implicated genes are involved in extracellular matrix organization, developmental process for body and eye, connective tissue cartilage and glycosylation protein activities. (ox.ac.uk)
The type VI collagen is an extracellular protein forming a distinct myofibrillar network of most interstitial connective tissues, existing in the cellular matrices of muscle, skin, tendon, cartilage, intervertebral discs, blood vessels and eyes. (bvsalud.org)

Even when we attempt to fix our gaze, small involuntary eye movements are performed in order to overcome loss of vision due to uniform stimulation of the retinal photoreceptors [1-4]. (heraldopenaccess.us)
Objective The relationship between retinal structure and function of glaucomatous eyes has attracted a great deal of research attention. (bmj.com)

The protein produced from this gene is found primarily in the inner ear and the eye. (medlineplus.gov)

Oral carbonic anhydrase inhibitors are equally effective in KPro eyes as in other postoperative indications. (masseyeandear.org)
However, because vitrectomized eyes are anatomically different from unoperated eyes, they are at increased risk for intra- and postoperative complications. (crstodayeurope.com)

The eyes are therefor required to bend light different amounts leading to different mechanisms of focus being used in different environments. (wikipedia.org)

Results In total, 129 eyes were included in the final analysis. (bmj.com)
A total of 38 eyes showed excycloduction, while another 38 showed incycloduction. (bmj.com)

Given that the eye possesses clear optics and shares many neural and vascular similarities to the brain, it offers a direct window to cerebral pathology. (frontiersin.org)
Using micro-optics, the single beam of a scanning laser is broken into 1008 beamlets to capture a single snapshot of the eye, Hall said. (aop.org.uk)

Further, the term primary angle closure suspect refers to an eye in which there is contact between the peripheral iris and the posterior trabecular meshwork, or in which contact is considered possible based on ocular anatomy, and there is no evidence of acute disease. (medscape.com)
The term dilacerations refers to an abrupt change in the axial inclination or curve in the crown or root of a tooth. (bvsalud.org)

A retrobulbar needle, also called an Atkinson needle, is commonly 23- or 25-gauge and 1.5 inches (38 mm) in length. (medscape.com)

1A) Results from a person with healthy eyes. (aao.org)

Anatomy32

Organisms5

Diseases46

Chemicals and Drugs5

Analytical, Diagnostic and Therapeutic Techniques and Equipment63

Psychiatry and Psychology9

Phenomena and Processes32

Disciplines and Occupations5

Technology, Industry, Agriculture3

Information Science6

Named Groups6

Health Care21

Geographicals2

Refractive error7

Elongation17

Retina5

Intraocular5

High myopia2

Biometry4

Lens12

Keratometry4

Myopia progression2

Eyeball2

Significant7

Refraction2

Thickness1

Myopic eye3

Progression2

Statistically1

Ophthalmic1

Scleral2

0.042

Interventions1

Assess1

Measurements1

Occur2

Influences1

Correction1

Visual acuity2

Methods2

Patients11

0.021

Structures of the eye1

Diameter1

Size4

Congenital1

Study6

Patient2

Hospital1

Fixation1

Patient's1

Acquired data1

Cataract surgery1

Vitrectomy2

Borderline1

Temporal1

Participants1

Cartilage2

Retinal2

Protein1

Postoperative2

Bend light1

Total2

Optics2

Refers2

Commonly1

Healthy1