Which test measures resolution acuity and is commonly used with infants?

• A. Teller acuity cards
• B. Landolt C chart
• C. HOTV chart
• D. Lea symbols

Answer: (A)

The concept being tested is resolution versus recognition acuity and how tests are suited to nonverbal infants. Teller acuity cards are designed specifically for infants and other nonverbal individuals by presenting a high-contrast grating on one side of a card and a blank field on the other. The tester determines whether the infant detects the pattern by observing who the infant looks at or by a forced-choice response. Because it relies on detecting spatial detail rather than identifying or naming something, it measures resolution acuity. It’s widely used with infants precisely because it doesn’t require language or symbolic recognition.

In contrast, the Landolt C chart uses a gap orientation that requires recognizing and indicating the direction of the gap, which depends on cognitive and language skills more typical of older children or adults. HOTV and Lea symbols are recognition-based: they require naming or matching symbols, again demanding development and language ability not present in infancy. So, Teller acuity cards best fit the goal of measuring resolution acuity in infants.