American Board of Ophthalmology (ABO) Practice Exam

What term is used to describe a lens that has a curvilinear profile, affecting the focus of light?

1. Convex lens

2. Aspheric lens

3. Biconcave lens

4. Planar lens

The correct answer is: Aspheric lens

The term used to describe a lens with a curvilinear profile that affects the focus of light is an aspheric lens. Unlike traditional spherical lenses, which have uniform curvature, aspheric lenses possess a varying curvature. This design allows for a more complex shape that helps to minimize optical aberrations, improve image quality, and provide better focus across a wider range of distances. Aspheric lenses are particularly beneficial in ophthalmic applications, as they can enhance visual acuity for individuals with refractive errors and improve the performance of eyeglasses and contact lenses. In contrast, convex lenses possess a uniform outward curvature and converge light rays, while biconcave lenses have a concave shape on both sides, diverging light rays. Planar lenses, with their flat surfaces, do not alter the focus of light in the same manner as curvilinear profiles. Therefore, the unique characteristics of aspheric lenses make them an essential choice in optical design, particularly for improving vision correction.