citation needed] Aniseikonia can occur naturally or be induced by the correction of a refractive error, usually anisometropia (having significantly different refractive errors between each eye) or antimetropia (being myopic (nearsighted) in one eye and hyperopic (farsighted) in the other. (wikipedia.org)
Ocular magnification and aniseikonia after cataract surgery has been widely ignored in modern cataract surgery. (open.ac.uk)
The purpose of this study was to analyse ocular magnification and inter‐individual differences in a normal cataract population with a focus on monovision. (open.ac.uk)
Based on the pseudophakic eye model in addition to these formulae, ocular magnification was extracted using matrix algebra (refraction and translation matrices and a system matrix describing the optical property of the entire spectacle corrected or uncorrected eye). (open.ac.uk)
With emmetropia for P and S the IOLP differences (S‐P) showed a standard deviation of 0.162/0.156/0.157 dpt and ocular magnification differences yielded a standard deviation of 0.0414/0.0405/0.0408 mm/mrad for the HofferQ/Haigis/Castrop setting. (open.ac.uk)
Vergence formulae for IOLP calculation sometimes implicitly define a pseudophakic eye model which can be directly used to predict ocular magnification after cataract surgery. (open.ac.uk)
Despite a strong similarity of both eyes, ocular magnification does not fully match between eyes and the prediction of ocular magnification and aniseikonia might be relevant to avoid eikonic problems in the pseudophakic eye. (open.ac.uk)
Aniseikonia is an ocular condition where there is a significant difference in the perceived size of images. (wikipedia.org)
Aphakia1
Aniseikonia due to uniocular aphakia is best corrected surgically by intraocular lens implantation. (wikipedia.org)
Differences1
Meridional aniseikonia occurs when these refractive differences only occur in one meridian (see astigmatism). (wikipedia.org)
Spectacle2
Spectacle correction is done by changing the optical magnification properties of the auxiliary optics (corrective lenses). (wikipedia.org)
The optical magnification properties of spectacle lenses can be adjusted by changing parameters like the base curve, vertex distance, and center thickness. (wikipedia.org)
Relative4
The principles behind this demonstration are relative distance magnification (closer objects appear larger) and asymmetrical convergence (the target is not an equal distance from each eye). (wikipedia.org)
A change in the relative magnification at the fixation point of the two eyes will result in which of the following changes? (proprofs.com)
A change in the relative magnification at the fixation point of the two eyes can result in the tilting of the horopter. (proprofs.com)
When there is a change in the relative magnification, it can cause a misalignment in the images seen by each eye, leading to a tilt in the horopter. (proprofs.com)
The difference in magnification can also be eliminated by a combination of contact lenses and glasses (creating a weak telescope system). (wikipedia.org)
citation needed] For reducing aniseikonia, similar to contact lens correction, optical image size difference will be reduced in refractive surgeries also. (wikipedia.org)
So this fixes is something called Aniseikonia, and Aniseikonia is the optometric word that describes the image difference and the end results in the inability to put images together in the brain. (brighteyestampa.com)
Fully1
When the disparity appears to vary across the visual field (field-dependent aniseikonia), as may be the case with an epiretinal membrane or retinal detachment, the aniseikonia cannot fully be corrected with traditional optical techniques like standard corrective lenses. (wikipedia.org)
Study1
Loutfallah, Michael (1938), "Aniseikonia: A Study of 836 Patients Examined with the Ophthalmo-Eikonometer", Trans Am Ophthalmol Soc. (wikipedia.org)
Eyes1
When this object is viewed with both eyes, it is seen with a small amount of aniseikonia. (wikipedia.org)
Lenses7
Spectacle correction is done by changing the optical magnification properties of the auxiliary optics (corrective lenses). (wikipedia.org)
The optical magnification properties of spectacle lenses can be adjusted by changing parameters like the base curve, vertex distance, and center thickness. (wikipedia.org)
The difference in magnification can also be eliminated by a combination of contact lenses and glasses (creating a weak telescope system). (wikipedia.org)
When the disparity appears to vary across the visual field (field-dependent aniseikonia), as may be the case with an epiretinal membrane or retinal detachment, the aniseikonia cannot fully be corrected with traditional optical techniques like standard corrective lenses. (wikipedia.org)
citation needed] For reducing aniseikonia, similar to contact lens correction, optical image size difference will be reduced in refractive surgeries also. (wikipedia.org)
Purpose The purpose of this study was to evaluate the validity of the iPad Aniseikonia Test for measurement size lens-induced aniseikonia. (bsz-bw.de)
Study1
Loutfallah, Michael (1938), "Aniseikonia: A Study of 836 Patients Examined with the Ophthalmo-Eikonometer", Trans Am Ophthalmol Soc. (wikipedia.org)
Target2
A way to demonstrate aniseikonia is to hold a near target (e.g., a pen or a finger) approximately 6 inches directly in front of one eye. (wikipedia.org)
The principles behind this demonstration are relative distance magnification (closer objects appear larger) and asymmetrical convergence (the target is not an equal distance from each eye). (wikipedia.org)