• While 99% of such surgeries are successful, the commonest side effect is a residual refractive error and poor uncorrected visual acuity (UCVA). (microsoft.com)
  • The aim of this pilot study was to estimate the magnitude of impairment of distant visual acuity (DVA) including refractive and non-refractive errors in institutionalized psychiatric patients awaiting resettlement in the community in Hong Kong. (springer.com)
  • Pinhole vision has always served as a benchmark for judgment of maximum level of visual acuity that can be attained in a patient with refractive error in the outpatient department. (healio.com)
  • Apart from these limitations, a number of factors also affect visual acuity such as refractive error, illumination, contrast and the location of the retina being stimulated. (utah.edu)
  • There is convincing evidence that screening with a visual acuity test identifies persons with refractive error. (aafp.org)
  • The USPSTF found adequate evidence that early treatment of refractive error, cataracts, and AMD improves or prevents loss of visual acuity. (aafp.org)
  • Visual acuity measured in this way is called Vernier acuity (a type of hyperacuity) and the discontinuity is specified in terms of its angular size (figure 7). (utah.edu)
  • We measured static, kinetic, and dynamic visual acuity (SVA, KVA, and DVA, respectively) of Japanese professional baseball players to ascertain whether there would be any difference in SVA, KVA, and DVA among player groups stratified according to their performance level. (dovepress.com)
  • Objective:We measured the extent and duration of generalization effects to various spatial tasks (i.e., visual acuity, Vernier acuity, and foveal crowding) through PL on the target's contrast detection. (iospress.com)
  • The pre- and post-learning tasks included lateral interactions at different target-to-flankers separations (i.e., 2, 3, 4, 8λ) and included a range of spatial frequencies and stimulus durations as well as visual acuity, Vernier acuity, contrast-sensitivity function, and foveal crowding. (iospress.com)
  • We also found generalization of PL to different stimuli and tasks: contrast sensitivity for both trained and untrained spatial frequencies, visual acuity for Sloan letters, and foveal crowding, and partially for Vernier acuity. (iospress.com)
  • The most commonly measured type, recognition visual acuity, is defined as the ability to discern certain optotypes (letters, numbers, or figures) at a specified distance. (preventblindness.org)
  • 3) To test the feasibility of using infant's recognition VA tests to measure VA in infants 16 - 42 months of age in terms of the testability and ability to measure VA. Methods Preliminary study 1 - Development of Face targets: Adults participated and visual acuity for various versions of face targets were tested under blur in comparison to ETDRS or Tumbling E optotypes. (uwaterloo.ca)
  • The Auckland Optotypes: An open-access pictogram set for measuring recognition acuity. (semanticscholar.org)
  • It is from this newly stimulated economy of images - tangible and abstract - that Jeffrey Chipps Smith champions the "visual acuity" of picture-makers in early-modern Germany. (sehepunkte.de)
  • Differences in visual acuity, foveal specialization and visual field between Harris's hawks, Parabuteo unicinctus , and black kites, Milvus migrans , may reflect differences in the perceptual demands of their foraging behaviours. (biologists.org)
  • Neither peripheral acuity, foveal acuity, nor eye-dominance scores correlated significantly with search time. (osapublishing.org)
  • Mean best-corrected visual acuity improved of 5.90 ± 11.29 ETDRS letters (P=0.0006). (omicsonline.org)
  • Accordingly, the rd10 EE mice at 1 year of age were still capable of performing the visual water task in photopic conditions, showing a residual visual acuity of 0.138±0 cycles/degree. (molvis.org)
  • Currently, the Teller Acuity Cards (TACs) are considered the gold standard for clinical testing and are effective in obtaining a quick estimate of an infant's VA, but they have certain drawbacks. (uwaterloo.ca)
  • PPP is a surgical maneuver performed in cases of higher-order aberrations, and it has been documented to enhance the visual potential by inducing a pinhole effect (Figures 1 and 2). (healio.com)
  • Visual acuity is limited by diffraction, aberrations and photoreceptor density in the eye (Smith and Atchison, 1997). (utah.edu)
  • This study investigated postoperative visual acuity and corneal higher-order aberrations following EX-PRESS or trabeculectomy. (springer.com)
  • Visual acuity and corneal higher-order aberrations were analyzed in both groups before and at 2 weeks, 1, 2, and 3 months after the surgeries. (springer.com)
  • Study of Difluprednate vs. Prednisolone Acetate on Visual Acuity, and Corneal Edema Following Cataract Surgery. (clinicaltrials.gov)
  • A Randomized, Masked Multi-center Safety & Efficacy Study of the Effects of Preoperative & Postoperative Cataract Surgery Use of Difluprednate Ophthalmic Emulsion, 0.05% Compared to Prednisolone Acetate Ophthalmic Suspension 1% on Visual Acuity & Corneal Edema. (clinicaltrials.gov)
  • Results revealed that pattern-reversal VER P1 latency was predictive (87%) of whether visual acuity was equal to (or better than) or worse than 20/100 and whether a patient would have good fixation behavior (fix and follow, FF) or poor fixation (no FF) (86%) (P less than .001). (biomedsearch.com)
  • Dizziness and visual complaints are common symptoms reported post-concussion. (unl.edu)
  • Chalita MR, Chavala S, Xu M, Krueger RR (2004) Wavefront analysis in post-LASIK eyes and its correlation with visual symptoms, refraction, and topography. (springer.com)
  • Visual acuity tests may be performed in many different ways. (medlineplus.gov)
  • The visual acuity tests were obtained using the Snellen letters while the Colour vision measurements were achieved through designed colour targets. (scribd.com)
  • The end result is the same in either case: a perceived improvement in acuity, which can be subjected to appropriate tests and measured. (perfumerflavorist.com)
  • An older offering, the Personal Vision Tracker, tests refraction numbers (spherical, cylindrical, and axis figures used to determine eyeglass prescriptions) but not visual acuity. (mobihealthnews.com)
  • After noticing these methodological differences between visual field and VA tests, we can ask why we so casually accept a testing procedure that does not stand up to other diagnostic procedures' standards. (cehjournal.org)
  • Objective acuity assessment by Visual Evoked Potential (VEP) provides a complementary assessment in those subjects who cannot complete subjective tests. (gla.ac.uk)
  • Step_ VEPs were 16% more successful than t-VEPs and 9% more successful than subjective tests in providing a complete acuity assessment. (gla.ac.uk)
  • That aperture, which can be measured by visual field tests, varies widely among different human subjects. (wikipedia.org)
  • Moreover, at each of the 52 locations used in a visual field text, the outcome is on a continuous scale, divided into 40 discrete steps (from 1 dB to 40 dB). (cehjournal.org)
  • The purpose of this study was to investigate in the same mouse the long-term effects of chronic exposure to an EE and assess the outcome of this manipulation on cone survival, inner retinal preservation, and visual behavior. (molvis.org)
  • While there can be substantial recovery of vision during reverse occlusion in the deprived eye of kittens that have been monocularly deprived from birth, in many situations this visual improvement does not appear to be retained following the introduction of binocular visual input. (jneurosci.org)
  • On the other hand, the long periods of reverse occlusion might be expected to lead to a permanent recovery of vision in only the initially deprived eye, since binocular visual input would have been introduced at a time when the cortex was no longer very plastic. (jneurosci.org)
  • These observations have important implications for the nature of the physiological and anatomical changes that occur in the visual cortex during reverse occlusion. (jneurosci.org)
  • Posterior staphyloma is typically associated with myopic degeneration and has not been recognized as a cause of reduced visual acuity in albinism. (nih.gov)
  • The pinhole effect blocks distorted and unfocused light rays emanating from the peripheral cornea and isolates more focused central and paracentral rays through the central aperture, thereby enhancing visual acuity and image quality. (healio.com)
  • Then, retinal preservation was assessed with immunocytochemistry, confocal microscopy examination, cone counts, and electron microscopy of the photoreceptor layer, while visual acuity was tested behaviorally with a Prusky water maze. (molvis.org)
  • In addition to our light fixtures, controls and daylighting solutions, Acuity Brands is dedicated to delivering a complete set of complementary, innovative lighting design software tools to deliver highly efficient, sustainable design methods and product applications. (acuitybrands.com)
  • This article considers the limitations of the commonly used methods for measuring visual acuity, and explores the developments in the field to address these issues. (aop.org.uk)
  • Standard optotype visual-acuity determinations were available in the follow-up records of 11 children (21 eyes), and fixation behavior was obtained in the remaining 16 children (32 eyes). (biomedsearch.com)
  • An optotype is a standardized letter, shape, picture or number used to show the subject whose visual acuity is being measured. (verywellhealth.com)
  • Both intensely cerebral and stupidly banging, "Visual Acuity" may fake being an aural equivalent of ADHD, but there is purpose to every twist and turn in this huge tune, the way that Raffertie pulls the music in and out of focus giving rise to its title. (ninjatune.com)
  • Up to 50% of people with Downs Syndrome will need to wear glasses, but even when glasses are worn, 100% of people with Down's syndrome have poorer visual acuity than other people. (downs-syndrome.org.uk)
  • Visual Acuity is still poor even when a person with Down's syndrome is wearing correctly fitted glasses for either long or short sight. (downs-syndrome.org.uk)
  • Also, one can be farsighted , but still measure 20/20 visual acuity with no glasses on. (verywellhealth.com)