Which testing method is typically used to assess infant acuity using a forced-choice looking paradigm?

• A. Pattern VEP
• B. Teller Acuity Cards
• C. Cardiff Cards
• D. Etdrs-Type Charts

Answer: (B)

Infant acuity is measured by how well a baby can detect patterns through looking behavior, since they can’t report what they see. In a forced-choice looking setup, the observer presents a pattern on one side of a card and a blank on the opposite side and decides which side the infant is looking toward, turning the infant’s gaze into a yes/no indication of pattern detection. Teller Acuity Cards are designed exactly for this approach. Each card shows a high-contrast grating on one half and a blank field on the other; the tester uses a sequence of cards with different spatial frequencies and records where the infant looks. By identifying the finest grating that consistently attracts the infant’s gaze, you estimate the visual acuity. This method is specifically tailored for nonverbal infants and relies on the forced-choice looking response to determine acuity. Pattern VEP relies on brain-wave responses rather than looking behavior, while ETDRS-type charts are intended for older, verbal or responsive individuals, and Cardiff Cards are another infant test but Teller Acuity Cards are the classic forced-choice looking tool.