Question

Q-1) draw a labelled sketch of the human eye. Explain the function of the following parts of the human eye -
a cornea
b iris
c pupil
d eye lens
e ciliary muscles
f retina
g optic nerves
Q-2) explain how we perceive object as they are.
Q-3) state any five precautions that are needed to take care of our eyes.
Q-4) explain how optical and non optical acid help visually challenged persons to develop their skills to a higher level.
Q-5) what is the Braille system how does it help the visually challenged persons?
please give me answer for all questions
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Answer 1

Answer:

Q2) a. Cornea: It is the front part of the eye. The light coming from objects    enters the eye through cornea.  

b. Iris: It controls the amount of light entering the eye.  

c. Pupil: It controls the illumination in the eye.  

d. Ciliary muscles: The focal length of the eye-lens can be changed by changing its shape by the action of ciliary muscles.  

e. Eye-lens: It focuses light on to the retina.  

f. Retina: It is a delicate membrane having a large number of light sensitive cells called ‘rods’ and ‘cones’ which respond to the intensity of light and colour of objects respectively.  

g. Optic nerve: It conveyes the image formed on the retina to the brain.

Q3)● Wash your eyes regularly .

     ● Do not rub your eyes with dirty hands .

     ● Do not read in very dim and very bright  light .

     ● Do not read in moving vehicles .

     ● Eat vegetables which are rich in vitamin A .

Q4) In Non-optical aids,they include

(i) tactual aids (the student can use their sense of touch ; then the visually impaired can learn to read and to write by using a special touch system called Braille. This make them use of raised dots on a paper.)

(ii)Auditory aids ( visually impaired can learn skills by sense of hearing i.e include audio like computer,calculator.  

Next is Optical aids: these include lenses and telescopic aids can help them to view class demonstration and the blackboard.

Q5)Braille is a language that is used to represent letters, numbers, punctuation marks and even entire words. The pattern of raised bumps or dots called Braille can be read with the fingers by those who are visually impaired or blind.