Question

Write short notes on
1. presbyopia ?
2. Astigmatism ?

Answer 1

Answer:

1.Presbyopia

Presbyopia is a condition associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects. Symptoms include difficulty reading small print, having to hold reading material farther away, headaches, and eyestrain. ... Presbyopia is a normal part of the aging process.

2. Astigmatism

Astigmatism is a type of refractive error in which the eye does not focus light evenly on the retina. This results in distorted or blurred vision at any distance. Other symptoms can include eyestrain, headaches, and trouble driving at night. If it occurs in early life it can later result in amblyopia.

Answer 2

Answer:

1. presbyopia :- Presbyopia is a condition associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects. Symptoms include difficulty reading small print, having to hold reading material farther away, headaches, and eyestrain.

Causes: Aging-related hardening of the lens of the eye

Symptoms: Hard time reading small print, having to hold reading material farther aw...

Other names: The aging eye condition

2. Astigmatism:- Astigmatism is an imperfection in the curvature of your eye’s cornea or lens. Normally, the cornea and lens are smooth and curved equally in all directions. This helps to focus light rays sharply onto the retina at the back of your eye. If your cornea or lens isn't smooth and evenly curved, light rays aren't refracted (bent) properly. Doctors call this a refractive error.