Question

on the basis of refraction how many types of defects of vision❓❓❓❓❓​

Answer 1

Answer:

There are mainly three common refractive defects of vision. ( myopia or near-sightednes) Hypermetropia or far – sightedness, ( Presbyopia.)

Answer 2

Answer:

there are two types of defect vision

1 myopia

Myopia occurs when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye. This causes light rays to focus at a point in front of the retina, rather than directly on its surface If you're nearsighted, the first number ("sphere") on your eyeglasses prescription will be preceded by a minus sign (–). The higher the number, the more nearsighted you are

Explanation:

0

Account

SEARCH

Toggle navigation

Home  All about vision  Eye Health  What are the most common types of eye defects

WHAT ARE THE MOST COMMON TYPES OF EYE DEFECTS

You are not alone! over 50% of population worldwide need a vision correctionMYOPIA or NEARSHIGHTED

Myopia occurs when the eyeball is too long, relative to the focusing power of the cornea and lens of the eye. This causes light rays to focus at a point in front of the retina, rather than directly on its surface If you're nearsighted, the first number ("sphere") on your eyeglasses prescription will be preceded by a minus sign (–).

HYPEROPIA

This vision problem occurs when light rays entering the eye focus behind the retina, rather than directly on it. The eyeball of a farsighted person is shorter than normal

Farsightedness can be corrected with glasses to change the way light rays bend into the eyes. If your glasses begins with plus numbers, like +1.50.