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Question
Give reason:
Blind spot is considered as 'area of no vision'.
Solution
- The blind spot is considered an 'area of no vision' because there are no sensory cells.
- This is the point at which the nerve fibres from all the sensory cells of the retina converge and bundle together to leave the eyeball as the optic nerve.
RELATED QUESTIONS
Write the function of the following part of the human eye: ciliary muscles
How does the eye regulate the amount of light that falls on the retina?
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Which lens has a greater focal length?
What is the principal function of the eye-lens?
Fill in the following blank with suitable word:
The part of eye sensitive to light is...................
To focus the image of a nearby object on the retina of an eye:
(a) the distance between eye-lens and retina is increased
(b) the distance between eye-lens and retina is decreased
(c) the thickness of eye-lens is decreased
(d) the thickness of eye-lens is increased
The term " accommodation" as applied to the eye, refers to its ability to:
(a) control the light intensity falling on the retina
(b) erect the inverted image formed on the retina
(c) vary the focal length of the lens
(d) vary the distance between the lens and retina
The human eye possesses the power of accommodation. This is the power to:
(a) alter the diameter of the pupil as the intensity of light changes
(b) distinguish between lights of different colours
(c) focus on objects at different distances
(d) decide which of the two objects is closer.
How much is our field of view:
with one eye open?
Name the following:
The photoreceptors found in the retina of the eye.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Cones : Iodopsim :: Rods : ______.
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during near vision?
What happens to the image distance in the normal human eye when we decrease the distance of an object, say 10 m to 1 m? Justify your answer.
Differentiate between:
Vitreous humour and Aqueous humour.
State the Function:
Iris
When light rays enter the eye, most of the refraction occurs at the ____________.
The innermost layer of human eye is ______.
Name the following:
Capacity of the eye to focus at different distances.
Match the following:
| Column - I | Column - II |
| 1. Retina | a. Path way of light |
| 2. Pupil | b. Far point comes closer |
| 3. Ciliary muscles | c. near point moves away |
| 4. Myopia | d. Screen of the eye |
| 5. Hypermetropia | e. Power of accommodation |
Match the terms in column I with those in column II and write down the matching pairs.
| Column I | Column II | ||
| (i) | Conjunctiva | (a) | Viral infection |
| (ii) | Cornea | (b) | Ciliary body |
| (iii) | Choroid | (c) | Spiral-shaped |
| (iv) | Cochlea | (d) | Transparent epithelium |
| (v) | Conjunctivitis | (e) | Suspensory ligament |
| (f) | Contains melanin | ||
| (g) | Transparent but appears black |
