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Examen
Certified Paraoptometric (CPO) - Unit III exam 2023 with 100% correct amswers
Visual Acuity (VA) 
The meausure of the finest detail the eye can detect. Typically described as a Snellen fraction. 
 
 
 
Snellen Letters 
Letters most often used to measure acuity at distance. 
 
 
 
Snellen Fraction (20/20) 
= Testing Distance / Distance at which letter is standardized to be read 
 
 
 
Snellen numerator 
Testing distance (usually 20 feet) 
 
 
 
Snellen denominator 
Distance at which the letter is supposed to be read. 
 
 
 
Cover/Uncover/Alternative-Cover Testing 
Examines...