The lens used to correct myopia is a concave lens.
Myopia, commonly known as nearsightedness, is a refractive error where distant objects appear blurry. This occurs because the eye focuses light in front of the retina instead of directly on it.
How Concave Lenses Correct Myopia
Based on the provided reference, a concave lens (also known as a minus lens) is utilized to correct myopia. Here's why:
- Diverging Light: A concave lens is designed to diverge, or spread out, the light rays before they enter the eye.
- Adjusting Focus: By diverging the light, the concave lens shifts the focal point backward, ensuring the light converges precisely on the retina. This allows for clear vision of distant objects.
Think of a concave lens like two prisms placed apex to apex, which causes the light passing through them to spread outward.
Summary of Myopia Correction Lens
| Lens Type | Purpose | Effect on Light | Condition Treated |
|---|---|---|---|
| Concave Lens | Refocus light | Diverges light | Myopia |
| (Minus Lens) | onto the retina |
Using the correct concave lens prescription helps individuals with myopia see distant objects clearly, improving their overall vision.
