Question

What are the 4 types of use/four categories of GPs?

a) Spherical, toric, multifocal, orthokeratology
b) Daily wear, extended wear, disposable, specialty lenses
c) Gas-permeable, hybrid, soft, scleral lenses
d) Aspheric, atoric, concentric, eccentric designs

Answer 1

The four types of contact lenses are spherical, Toric, multifocal, and orthokeratology, each designed to correct different vision issues such as myopia, hyperopia, astigmatism, and presbyopia.

Step-by-step explanation:

The four categories of contact lenses are: spherical, toric, multifocal, and orthokeratology. Spherical lenses have one power across the entire lens and are used to correct myopia (nearsightedness) or hyperopia (farsightedness). Toric lenses are designed to correct astigmatism, which is caused by an irregular curvature of the cornea or lens, and have different powers in different meridians of the lens. Multifocal lenses have multiple powers in one lens to correct presbyopia, allowing for clear vision at all distances. Lastly, orthokeratology lenses are specially designed to temporarily reshape the cornea to reduce or correct myopia or astigmatism, offering the wearer clear vision without the need for glasses or lenses during the day.