Photorefraction vision screening: value, constancy and credibility
نویسندگان
چکیده
منابع مشابه
Pre-constancy Vision in Infants
Our visual system can easily estimate the constant color and material of external objects despite dynamic changes in the retinal image across viewpoints and illuminations in natural scenes. It is commonly believed that this high-level visual function, called "perceptual constancy," is acquired through postnatal learning [1], building upon low-level functions that have developed earlier, such as...
متن کاملIs Noncycloplegic Photorefraction Applicable for Screening Refractive Amblyopia Risk Factors?
PURPOSE To compare the accuracy of noncycloplegic photorefraction (NCP) with that of cycloplegic refraction (CR) for detecting refractive amblyopia risk factors (RARFs) and to determine cutoff points. METHODS In this diagnostic test study, right eyes of 185 children (aged 1 to 14 years) first underwent NCP using the PlusoptiX SO4 photoscreener followed by CR. Based on CR results, hyperopia (≥...
متن کاملVision sensor with brightness constancy: towards neuromorphic color vision
A silicon retina is a VLSI (very large scale integration) chip that has been designed based on the neural architecture and functionality of a biological retina. Such devices are expected to be useful as a novel vision sensors for autonomous mobile robots due to their power efficiency, compactness, and real-time processing ability. In addition, their low noise output and wide operating range are...
متن کاملColour vision: Is colour constancy real?
Colour constancy is typically weaker in the laboratory than it seems in our everyday experience. New measurements using real-world stimuli show that colour constancy is in fact almost perfect, and that several different perceptual mechanisms contribute to achieving it.
متن کاملPreschool vision screening: negative predictive value for amblyopia.
BACKGROUND/AIMS Single optotype tests of visual acuity are widely used for preschool vision screening in order to optimise cooperation with testing. These tests may, however, underestimate the visual acuity deficit in amblyopia because they lack visual crowding. This study assessed the resultant negative predictive value (NPV) for amblyopia. METHODS Cohort study of 936 children in the Cambrid...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the Egyptian Ophthalmological Society
سال: 2019
ISSN: 2090-0686
DOI: 10.4103/ejos.ejos_29_19