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प्रश्न
Compare the following: Choroid and retina
उत्तर
| Choroid | Retina | ||
| 1 | Choroid is the middle vascular layer of eye. | Retina is the innermost nervous coat of eye. | |
| 2 | It contains numerous blood vessels that provide nutrients and oxygen to retina and other tissues. | It contains photoreceptor cells, rods and cones that are associated with twilight and colour vision respectively. |
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संबंधित प्रश्न
The optical prescription for a pair of spectacles is :
Right eye : −3.50 D
Left eye : −4.00 D
Are these lenses thinner at the middle or at the edges?
A person got his eyes tested by an optician. The prescription for the spectacle lenses to be made reads :
Left eye : +2.50 D
Right eye : +2.00 D
State whether these lenses are thicker in the middle or at the edges.
What is the least distance of distinct vision for a normal human eye?
Give the scientific names of the following parts of the eye:
carries signals from an eye to the brain.
Fill in the following blank with suitable word:
Most of the refraction of light rays entering the eye occurs at the outer surface of the.............
A person walking in a dark corridor enters into a brightly lit room:
State the effect on the pupil of the eye.
There are two types of light-sensitive cells in the human eye:
Where are they found?
The descriptions of five kinds of images are given below:
(a) diminished and virtual
(b) enlarged and real
(c) enlarged and erect
(d) real and inverted
(e) virtual and the same size
Which one of these describes the image formed:
(i) on the retina of the eye?
(ii) by a magnifying glass?
(iii) by a convex driving mirror on a car?
(iv) by a plane mirror?
(v) on the screen of a slide projector?
Suggest how your irises help to protect the retinas of your eyes from damage by bright light.
After testing the eyes of a child, the optician has prescribed the following lenses for his spectacles:
Left eye : + 2.00 D
Right eye : + 2.25 D
The child is suffering from the defect of vision called:
(a) short-sightedness
(b) long-sightedness
(c) cataract
(d) presbyopia
Out of animals of prey and predators, which have their eyes:
at the front of their head?
With both eyes open, a person's field of view is about:
(a) 90°
(b) 150°
(c) 180°
(d) 360°
Mention if the following statement is true (T) or false (F) Give reason.
Blind spot is called so because no image is formed on it.
Given below is a set of five parts. Rewrite them in correct sequence.
Conjunctiva, retina, cornea, optic nerve, lens.
Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.
Eyes of the nocturnal birds have large cornea and a large pupil. How does this structure help them?
______ of the eye is comparable to the film of a camera.
Vitreous humour is present between ______.
Name the following:
Place of no vision in the retina of the eye.
Name the following:
Three layers of the eye ball.
