SET - 1
In which layer does the light enter the eye?
A) PUPIL
B) CORNEA
C) IRIS
D) CRYSTALLINE LENS
B) CORNEA
The front transparent part of Sclera is known as?
A) IRIS
B) CRYSTALLINE LENS
C) AQUEOUS HUMOUR
D) CORNEA
D) CORNEA
How many types of Photoreceptor cells are present in our eye?
A) 1
B) 2
C) 3
D) 5
B) 2
What can happen when the lens become damaged or clouded?
It will scatter and block the light as it passes through the lens.
What can cause pupil to dilate or constrict abnormally?
Head injury, stroke and tumor can all cause changes in pupil size.
A person has a condition where they have difficulty in seeing colours. Explain which part of retina is likely to be affected.
Color blindness (color vision deficiency) is a fairly common condition in which you don't see colors in the traditional way. This happens when cones (a type of nerve cell in your eye retina) aren't working correctly.
Describe how ciliary muscles work differently for near vision versus far vision.
During far vision, the ciliary bodies relax, the zonule stretch, and the lens flattens. During near accommodation, the ciliary bodies contract (i.e., shorten), which relaxes the zonule and rounds the lens (i.e., thickens it). This brings the near object into focus.
Yashvant has been seen scratching his eye a lot. He goes to the doctor for treatment of his eye, but nothing works. This severe scratching of eye lead him to infections in his eye and eventually lost his eye sight. Which part of his eye was damaged?
Cornea
Explain how brain is able to understand what we see through eyes.
The retina acts as a screen for the inverted image obtained from crystalline lens. This image is converted into electric impulses and are transported to brain through optic nerve. These impulses are decoded by the brain and an erect image of what we see is obtained.