American Board of Opticianry (ABO) Practice Test

How are Fresnel prisms typically applied to lenses?

1. Defined as grams per cubic centimeter

2. Applied to the back of the lens with the ridged side out

3. Most children are born hyperopic

4. A minus lens moved further away from the eye has is compensated with

The correct answer is: Applied to the back of the lens with the ridged side out

Fresnel prisms are typically applied to lenses in a certain way to achieve a specific effect. Option A, which is defined as grams per cubic centimeter, is not a relevant explanation for applying Fresnel prisms to lenses. Option C, which mentions hyperopia, is also not related to the process of applying Fresnel prisms. Option D, which describes a minus lens being moved further away from the eye, is also not relevant to the application of Fresnel prisms. The correct answer is option B, which states that the ridged side of the prism is placed on the back of the lens. This is because the ridged side helps to hold the prism in place and prevent it from slipping. It also allows the prism to have a more effective and stable effect on the light entering the eye.