(a) A person cannot read newspaper placed nearer than 50 cm from his eyes. Name the defect of vision he is suffering from. Draw a ray diagram to illustrate this defect. List its two possible causes. Draw a ray diagram to show how this defect may be corrected using a lens of appropriate focal length. (b) We see advertisements for eye donation on television or in newspapers. Write the importance of such advertisements.
Answers
Answer:
He is suffering from the disease known as- Hypermetropia or far- sightedness.
Far-sightedness
Explanation:
Far-sightedness is a condition that occurs when the eyeball is slightly bigger than normal. This causes the focus point to be behind the retina, at the back of the eye. A person suffering from this condition will find it difficult to see clearly the objects that are closer to him. Example: Words on the newspaper will look blurred. It is known as hyperopia in the medical terms. Far-sightedness can be treated by wearing spectacles or contact lens. There is also an option to correct it permanently through laser surgery of the affected eye.
Eyes can be donated after one's death. Only the cornea is transplanted from the dead to a person with corneal blindness. It is an act of charity and totally voluntary.
