A concave lens is called a diverging lens In concave lens, spherical surfaces are recessed inwards.
It is thinned out in the middle.
When parallel beam of light is passed through concave lens, light rays spread out to different directions.
Hence, a concave lens is called a diverging lens.
Nearsightedness (myopia) is corrected with lenses called “minus power lenses.” They are concave-shaped and help the eyes focus light properly. Myopia causes a person to see distant objects as blurry. Prescription eyeglasses or contact lenses can usually correct this blurry distant vision.
The focusing power of an eye with myopia is stronger than a normal eye. It brings light to a focal point in front of the retina, instead of on the retina.
A lens used to correct myopia works by reducing the focusing power of the eye. This is why it is called a "minus power lens" (or "minus lens").
Minus lenses are concave in shape. In other words, they are thinnest at the center and thicker at the edge. This lens shape moves the focus of light from in front of the retina directly onto its surface. This shift corrects the blurry distance vision caused by nearsightedness.
The power of a lens that corrects myopia is measured in units called diopters (D). The lens powers on an eyeglass prescription for myopia always begin with a minus sign. The higher the power number of the lens, the more myopia it corrects.
For example, a -6.00 D lens corrects twice the amount of nearsightedness as a -3.00 D lens.
High-index lenses are typically recommended for correcting nearsightedness greater than -3.00 diopters. They are thinner and lighter than regular plastic lenses, so they are more attractive and comfortable.
Answer:
Its actually concave lenses
Explanation:
As someone who wears glasses, there are different lenses or 'levels' of eyesight that requires a personalized prescription.