18 Questions
What happens to the lens when viewing near objects?
It becomes more thick and convex
What is the function of the rod cells in the retina?
To detect dim light
What is the function of the cone cells in the retina?
To detect color
What is the purpose of a hand lens?
To see very small objects
What is the reason for the blind spot?
A lack of light-sensitive cells
What is the correction for short sight?
Wearing glasses with a concave lens
What is the function of the ciliary muscles in the eye?
To focus light onto the retina by changing the thickness of the lens
What is the role of the optic nerve in the process of seeing?
To transmit messages from the retina to the brain
What is the purpose of the cornea in the eye?
To allow light to enter the eye
What is the function of the eyebrow in the eye?
To prevent sweat from entering the eye
What is the reason for the blind spot on the retina?
The optic nerve leaves the eye at that point
What is the effect of more pigment in the iris?
Eye colour is grey or brown
What is the purpose of wearing concave lenses in long sighted individuals?
To bend light before it reaches the eye and focus it back onto the retina
What is the main cause of astigmatism?
Irregular cornea or lens
What determines the pitch of a sound?
The frequency of sound
What is the result of an image formed behind the retina?
Long sight
What is the correction method for cataract?
Replacing the lens with an artificial lens by surgery
What is the purpose of the three cone cells in the eye?
To distinguish between different colours
This quiz covers the concept of long sight, its causes, and correction methods. Understand how concave and convex lenses help in focusing light onto the retina. Learn about the problems and solutions related to long sight.
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