Visual Assessment and Testing Flashcards
6 cards from real COA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Visual Assessment and Testing flashcards as text
Which of the following is the CORRECT procedure for occluding the eye NOT being tested during monocular visual acuity testing?
Answer: Place an opaque occluder firmly over the non-tested eye
An opaque occluder placed firmly over the non-tested eye prevents light from entering while avoiding the squinting artifact and pressure artifacts associated with closing the eye or pressing the palm against the globe.
The Amsler grid is used to detect central visual field defects. A patient reports that the central dot disappears and surrounding lines appear wavy. This finding is MOST consistent with:
Answer: Macular pathology such as age-related macular degeneration
The Amsler grid tests the central 20 degrees of the visual field. Wavy or distorted lines (metamorphopsia) and a central scotoma are classic findings in macular diseases such as AMD, macular edema, or epiretinal membrane.
When recording color vision results from Ishihara testing, a patient correctly identifies 8 of 14 test plates. How should this be documented?
Answer: Color vision: 8/14 plates correct (abnormal)
Results are documented as the number of plates correctly identified out of total plates tested. Normal typically requires correct identification of 13–14/14 plates; 8/14 is below normal and documents a color vision deficiency without the COA speculating on type.
A patient is asked to read the 20/20 line but misses two letters. How is this properly documented in Snellen notation?
Answer: 20/20 -2
When a patient reads most but not all letters on a line, the acuity is recorded as the line size with a minus for each letter missed (e.g., 20/20 -2 means 3 of 5 letters read correctly on the 20/20 line).
Which visual acuity chart uses pictures such as a house, apple, and umbrella instead of letters, and is most appropriate for which patient population?
Answer: Allen chart — for preschool children aged 2.5 to 5 years
The Allen chart uses common pictures (birthday cake, horse, hand, car, etc.) that pre-school children recognize. It is used for children approximately 2.5 to 5 years old who cannot yet identify letters.
What is the primary clinical reason for performing a stereoacuity test such as the Randot or Titmus Fly test?
Answer: To assess binocular fusion and depth perception
Stereoacuity tests measure fine depth perception, which requires binocular fusion and intact sensory and motor alignment. They are used to assess amblyopia treatment outcomes, strabismus, and binocular vision disorders.