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प्रश्न
Differentiate between:
Retina and Choroid.
उत्तर
| Retina | Choroid |
| (i) It is the innermost layer of the eye-ball. | It is the middle layer of eye ball tunics. |
| (ii) It contains neurons. | It contains blood capillaries. |
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संबंधित प्रश्न
Write the function of retina in human eye.
Define the term.
Power of accommodation of the eye.
Distinguish between: aqueous humor and vitreous humor
What is the function of the lens in the human eye?
Give the scientific names of the following parts of the eye:
changes shape to focus a picture on the retina.
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
the focal length of eye-lens will be the maximum?
The eyes of a person are focused (i) on a nearby object, and (ii) on a distant object, turn by turn. In which case:
the converging power of eye-lens will be the maximum?
Why does the eye-lens not have to do all the work of converging incoming light rays?
Mention if the following statement is true (T) or false (F) Give reason.
Ciliary muscles regulate the size of the pupil
Name the respective organs in which the following are located and mention the main function of each:
(i) Iris
(ii) Semicircular canals
Name the following:
The area where the image is formed but not seen by our eye is termed as.
A small hole of changing diameter at the centre of Iris is called _______.
For a normal human eye the near point is at _______.
Shylesh is a school-going kid studying standard VIII. He is crazy about playing video games on mobile phones. After a couple of months, his eyes turned red and he felt severe pain in his eyes. His science teacher enquired about this and advised his parents to take him to an eye doctor.
- How does excessive usage of mobile phone affect our eyes?
- What are the values shown by the teacher?
Assertion: Blind spot is a small area of the retina which is insensitive to light where the optic nerve leaves the eye.
Reason: There are no rods or cones present at the junction of the optic nerve and retina in the eye.
We cannot distinguish colours in dim light. Explain giving suitable reasons.
Write down the names of parts of the eye in the blank spaces shown in the figure.
______ is a transparent layer.
The coloured portion of the eye is the ______.
Which cells of the retina enable us to see coloured objects around us?
