The effect of pupil and observation distance on the contrast sensitivity function
| Autor: | Carlos Illueca, M. M. Segui, Consuelo Hernández, Begoña Domenech |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Adult
genetic structures Stimulus (physiology) Pupil Contrast Sensitivity chemistry.chemical_compound Optics Vision Monocular Pupil function Humans Sensitivity (control systems) Mathematics business.industry Distance Perception Accommodation Ocular Retinal eye diseases Sensory Systems Ophthalmology Spherical aberration chemistry sense organs business Monocular vision Accommodation Optometry |
| Zdroj: | Ophthalmic and Physiological Optics. 16:336-341 |
| ISSN: | 1475-1313 0275-5408 |
| DOI: | 10.1046/j.1475-1313.1996.95001166.x |
| Popis: | Measuring the contrast sensitivity function (CSF) is becoming more frequent in the analyses that are routinely done in optometric practice. This measurement is generally done in far vision, and the observation distance and its effects are not considered to significantly alter this function. Among these effects we should point out the accommodation of the visual optical system to the stimulus and the errors in accommodation associated with this, changes in pupil diameter and therefore in retinal illumination when the observation distance changes, the different level of aberrations (spherical aberration, astigmatism) for different cases, and so on. All of these factors contribute to the fact that the contrast sensitivity of a visual system varies according to the accommodative stimulus. In this study we attempt to clarify the influence of these different parameters by evaluating the CSF for three observation distances. The study was done in monocular vision, with a natural pupil and with a 3 mm artificial pupil that made it possible to maintain the same level of retinal illumination for all distances. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text