Practice Quiz

Ophthalmic Technician

Category - Visual Assessment

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What is the design criteria incorporated for visual acuity assessment by ETDRS Test?
  1. Only five letters per row
  2. The rows are separated by equal spacing on a log scale(by 0.1 log unit)
  3. Equal spacing of the letters on the log scale
  4. Each row is balanced for letter difficulty
  5. All of the above
Explanation
Answer: E - The design criteria for the early treatment diabetic retinopathy study (ETDRS) includes the following: Only five letters per row, the rows are separated by equal spacing on a log scale (by 0.1 log unit), equal spacing of the letters on the log scale, each row is balanced for letter difficulty.

The ETDRS acuity was designed to overcome the inaccuracies with Snellen’s acuity test. It has now become the worldwide standard for visual acuity assessment.
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