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Long Sight and Correction

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Questions and Answers

What happens to the lens when viewing near objects?

It becomes thinner and less convex
It becomes more thick and convex (correct)
It remains the same shape
It changes color

What is the function of the rod cells in the retina?

To detect color
To detect dim light (correct)
To enhance peripheral vision
To perceive depth

What is the function of the cone cells in the retina?

To perceive depth
To enhance peripheral vision
To detect dim light
To detect color (correct)

What is the purpose of a hand lens?

To see very small objects (C) Signup and view all the answers

What is the reason for the blind spot?

A lack of light-sensitive cells (D) Signup and view all the answers

What is the correction for short sight?

Wearing glasses with a concave lens (B) Signup and view all the answers

What is the function of the ciliary muscles in the eye?

To focus light onto the retina by changing the thickness of the lens (A) Signup and view all the answers

What is the role of the optic nerve in the process of seeing?

To transmit messages from the retina to the brain (D) Signup and view all the answers

What is the purpose of the cornea in the eye?

To allow light to enter the eye (A) Signup and view all the answers

What is the function of the eyebrow in the eye?

To prevent sweat from entering the eye (A) Signup and view all the answers

What is the reason for the blind spot on the retina?

The optic nerve leaves the eye at that point (A) Signup and view all the answers

What is the effect of more pigment in the iris?

Eye colour is grey or brown (B) Signup and view all the answers

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 (C) Signup and view all the answers

What is the main cause of astigmatism?

Irregular cornea or lens (D) Signup and view all the answers

What determines the pitch of a sound?

The frequency of sound (D) Signup and view all the answers

What is the result of an image formed behind the retina?

Long sight (D) Signup and view all the answers

What is the correction method for cataract?

Replacing the lens with an artificial lens by surgery (B) Signup and view all the answers

What is the purpose of the three cone cells in the eye?

To distinguish between different colours (B) Signup and view all the answers