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COMPUTERIZED LETTER CHARTS
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COMPUTERIZED LETTER CHARTS

Computerized Letter Charts allow accurate refractions by randomly generating either numbers, letters, symbols or pictures and by changing the contrast levels. The eye detects objects by responding to the differing levels of illumination at the edges of visual targets. Contrast acuity or sensitivity, therefore, has to do with the ability of the eye to resolve a given target against the background illumination. The closer the levels of target illumination and background illumination, the more difficult it becomes to resolve and hence identify the target. A reduction of contrast acuity occurs in many eye disorders, especially corneal diseases, cataracts, and retinal degenerative disorders.



 
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