Defects in Vision

Q.

Define far point and near point.

Q. Explain the structure and function of eye and its parts in detail. Also explain myopia, hypermetropia and presbyopia.

Q. Explain presbyopia in detail with diagram.

Q.

Which eye defect can be corrected by placing a concave lens of required strength?

Q. The normal eye which can sufficiently refract light rays from an object 20 ft. (6 mt.) away to focus clear object on retina is called as

1. Myopic
2. No specific name
3. Hypermetrophic
4. Emmetropic

Q. A person wears concave lenses for correcting vision. When he is not using the lenses, the image of an object kept at a considerable distance from him will be formed

1. on the blind spot
2. in front of the retina
3. on the yellow spot
4. behind the retina

Q. Match the following eye defects with its features:

1. Uneven curved cornea
2. Far sightedness
3. Near sightedness

Q.

Give the biological/technical term for the following:

An eye defect in which the cornea becomes uneven.

Q. In myopia or short sightedness:

1. Image is formed slightly in front of retina because eye ball is longer
2. Eye ball is normal but image is formed over blind spot
3. Eye ball is normal but images is formed slightly behind the retina due to faulty lens
4. Curvature of cornea becomes irregular

Q. A person wears concave lenses for correcting vision. When he is not using the lenses, the image of an object kept at a considerable distance from him will be formed

1. on the blind spot
2. behind the retina
3. in front of the retina
4. on the yellow spot

Q. A person is bearing spectacles with concave lenses for correcting vision. While not using the glasses, the image of distant object in this case will be formed.

1. Behind retina
2. On blind spot
3. On yellow spot
4. In front of retina