## **Core Concept**
Presbyopia is a age-related condition characterized by the loss of near vision due to decreased elasticity of the **lens** and reduced **accommodation** of the eye. This condition typically becomes noticeable in the early to mid-40s. The primary goal of treating presbyopia is to improve near vision.

## **Why the Correct Answer is Right**
The correct answer involves the use of **convex lenses** (reading glasses) which are thicker in the middle than at the edges. These lenses converge light rays before they enter the eye, making it easier for the presbyopic eye to focus on near objects. This works because the converging power of the lens helps to compensate for the reduced focusing power of the eye's lens.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because presbyopia cannot be treated with **concave lenses**, which are thinner in the middle and are used to correct **myopia (nearsightedness)**.
- **Option B:** This option is incorrect as **astigmatism correction** does not treat presbyopia. Astigmatism is a different refractive error caused by irregularities in the shape of the cornea or lens.
- **Option C:** This option is incorrect because while **contact lenses** can be used to correct presbyopia, the statement is too vague and does not directly address a common method like reading glasses.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that presbyopia is a universal age-related change, and nearly everyone will experience it. A simple and effective way to correct presbyopia is with **reading glasses**; however, other options like **bifocal glasses**, **progressive lenses**, and certain types of **contact lenses** and **surgical interventions** are also available.

## **Correct Answer:** . Convex lenses.