(a) Cataract: A cataract is caused by the clouding of the lens in the eye, which leads to a decrease in vision. This can occur due to aging, long-term exposure to sunlight, exposure to radiation, or it can be present at birth. Certain diseases, such as diabetes, or behaviors, like smoking and alcohol use, can also increase the risk of cataracts.

Correction: Cataracts can be corrected through surgery. The cloudy lens is removed and replaced with an artificial lens. This surgery is generally safe and effective, restoring vision.

(b) Presbyopia: Presbyopia is caused by the loss of elasticity of the lens of the eye, usually due to aging. As the lens becomes less flexible, it becomes more difficult for the eye to focus on close objects.

Correction: Presbyopia can be corrected with glasses or contact lenses. In some cases, surgery may be an option. There are several types of surgical procedures that can be used to correct presbyopia, including laser procedures, implantation of a corrective lens, or replacing the lens of the eye.

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(a) Cataract: A cataract is caused by the clouding of the lens in the eye, which leads to a decrease in vision. This can occur due to aging, long-term exposure to sunlight, exposure to radiation, or it can be present at birth. Certain diseases, such as diabetes, or behaviors, like smoking and alcohol use, can also increase the risk of cataracts.

Correction: Cataracts can be corrected through surgery. The cloudy lens is removed and replaced with an artificial lens. This surgery is generally safe and effective, restoring vision.

(b) Presbyopia: Presbyopia is caused by the loss of elasticity of the lens of the eye, usually due to aging. As the lens becomes less flexible, it becomes more difficult for the eye to focus on close objects.

Correction: Presbyopia can be corrected with glasses or contact lenses. In some cases, surgery may be an option. There are several types of surgical procedures that can be used to correct presbyopia, including laser procedures, implantation of a corrective lens, or replacing the lens of the eye.

Knowee AI · Accepted Answer

(a) Cataract: A cataract is caused by the clouding of the lens in the eye, which leads to a decrease in vision. This can occur due to aging, long-term exposure to sunlight, exposure to radiation, or it can be present at birth. Certain diseases, such as diabetes, or behaviors, like smoking and alcohol use, can also increase the risk of cataracts.

Correction: Cataracts can be corrected through surgery. The cloudy lens is removed and replaced with an artificial lens. This surgery is generally safe and effective, restoring vision.

(b) Presbyopia: Presbyopia is caused by the loss of elasticity of the lens of the eye, usually due to aging. As the lens becomes less flexible, it becomes more difficult for the eye to focus on close objects.

Correction: Presbyopia can be corrected with glasses or contact lenses. In some cases, surgery may be an option. There are several types of surgical procedures that can be used to correct presbyopia, including laser procedures, implantation of a corrective lens, or replacing the lens of the eye.

What are the causes of the following defects of vision and how can they be corrected ?(a) Cataract(b) Presbyopia

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