Isometropia hyperopia as an amblyogenic factor is characterized by a prescription greater than how many diopters in BOTH eyes?

• A. +3.00D
• B. +5.00D
• C. +7.00D
• D. +6.00D

Answer: (B)

The idea to grasp here is how bilateral, or isometropic, hyperopia can disrupt normal visual development. When both eyes are highly hyperopic, each eye must accommodate a lot to see clearly at a distance. This constant accommodative demand tends to blur the retinal images during critical periods of visual development, and because both eyes are affected similarly, the brain receives poor-quality and poorly fused input from both eyes. Over time, this bilateral blur reduces the stimulus for clear, stable vision in both eyes, leading to bilateral amblyopia even with glasses.

In clinical teaching and NBEO-style guidelines, this bilateral amblyogenic risk becomes particularly significant when the hyperopia in each eye exceeds about +5.00 diopters. So, higher bilateral hyperopia is the threshold at which isotropic hyperopia is considered amblyogenic. The other numerical options are either below that level or represent different clinical cutoffs that aren’t the standard threshold for isometropic hyperopia causing amblyopia.