What type of contact lens is referred to as "lenticular"?

What type of contact lens is referred to as "lenticular"?

• A. High minus CTL
• B. Low plus CTL
• C. Standard spherical lenses
• D. High plus and high minus CTL

Answer: (D)

Lenticular contact lenses are designed with a specific geometry that allows them to address severe refractive errors, particularly in cases of high prescriptions. The term "lenticular" refers to the lens design, which resembles a lentil, having a central area for vision correction that is surrounded by a thinner edge. These lenses are primarily used for both high plus and high minus prescriptions. In the case of high minus prescriptions, the center must retain the necessary corrective power while minimizing the thickness at the edge to ensure a comfortable fit and better aesthetics. For high plus prescriptions, lenticular lenses can also reduce the overall thickness and weight, which is important for comfort and handling. Standard spherical lenses typically do not have the unique shape that characterizes lenticular lenses, as they are usually uniform in thickness throughout. Similarly, low plus lenses generally do not require the specific design features of a lenticular lens since they do not impose the same level of thickness concerns as high prescriptions do. Thus, the reference to high plus and high minus CTL as lenticular lenses correctly identifies the intended design that addresses the challenges associated with severe refractive errors in vision correction.

Lenticular contact lenses are designed with a specific geometry that allows them to address severe refractive errors, particularly in cases of high prescriptions. The term "lenticular" refers to the lens design, which resembles a lentil, having a central area for vision correction that is surrounded by a thinner edge.

These lenses are primarily used for both high plus and high minus prescriptions. In the case of high minus prescriptions, the center must retain the necessary corrective power while minimizing the thickness at the edge to ensure a comfortable fit and better aesthetics. For high plus prescriptions, lenticular lenses can also reduce the overall thickness and weight, which is important for comfort and handling.

Standard spherical lenses typically do not have the unique shape that characterizes lenticular lenses, as they are usually uniform in thickness throughout. Similarly, low plus lenses generally do not require the specific design features of a lenticular lens since they do not impose the same level of thickness concerns as high prescriptions do.

Thus, the reference to high plus and high minus CTL as lenticular lenses correctly identifies the intended design that addresses the challenges associated with severe refractive errors in vision correction.