Variation in vernier acuity with age
| Autor: | Marion H. Edwards, Brian Brown, Roger W. Li |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Adult
Male medicine.medical_specialty Aging genetic structures Psychometrics Visual Acuity Audiology law.invention Optics Age groups law Vernier bias medicine Psychophysics Humans Vernier acuity Aged Hyperacuity Vernier scale business.industry Middle Aged Sensory Systems Form Perception Ageing Ophthalmology Variation (linguistics) Visual function Female business Psychology |
| Zdroj: | Vision Research. 40(27):3775-3781 |
| ISSN: | 0042-6989 |
| DOI: | 10.1016/s0042-6989(00)00212-1 |
| Popis: | Many visual functions deteriorate with increasing age, vernier acuity apparently being an exception. We used an improved experimental protocol to investigate vernier thresholds in subjects in four age groups. Vernier threshold was found to increase with increasing age, and the difference in this, compared with previous findings is probably due to the smaller inter-pixel angle used. Vernier acuities in young subjects in other studies seem to have been underestimated. As vernier acuity did not vary with retinal illuminance and the sensitivity loss does not seem to be a learning effect, neural rather than optical changes are likely to account for the deterioration. Measurement of vernier acuity may have clinical application in the determination of visual function behind cataract, and it will be necessary to consider the effect of age on vernier acuity. |
| Databáze: | OpenAIRE |
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