Anisometropia hyperopia as an amblyogenic factor is characterized as a difference > ___________D between the two eyes.

• A. > +0.50D
• B. > +0.75D
• C. > +1.00D
• D. > +1.50D

Answer: (C)

When the two eyes differ in hyperopia by more than one diopter, it becomes a strong amblyogenic factor because the eye that is more hyperopic sends a blurrier image to the brain. To avoid confusion or double vision, the brain tends to suppress the blurred eye during the critical period of visual development. That suppression reduces stimulation to that eye, increasing the chance of developing amblyopia. Clinically, a difference of 1.00 diopter or more is the threshold commonly used to identify hyperopic anisometropia as a risk for amblyopia, explaining why the correct choice is greater than 1.00 D. Smaller differences can still pose risk in some individuals, but the 1.00 D cutoff is the standard benchmark.