7th answer plse
Dear student
a) Cataract - lens turns opaque. In this defect, the crystalline lens becomes milky and cloudy. This causes partial or complete loss of vision.
b) Astigmatism - Vision becomes distorted when the surface of the cornea has an uneven curvature.
c) Dry eyes - deficiency of vitamin A can lead to complete blindness or dying corneas, which are characterized by marks called Bitot's spots.
d) Presbyopia (Ageing vision defect) - is a common defect of vision, which generally occurs at old age. A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively.
e) Myopia (short sightedness) - is a defect of vision in which a person clearly sees all the nearby objects, but is unable to see the distant objects comfortably and his eye is known as a myopic eye.
f) Hypermetropia (Long sightedness) - is a defect of vision in which a person can see distant objects clearly and distinctively, but is not able to see nearby objects comfortably and clearly.
Regards
a) Cataract - lens turns opaque. In this defect, the crystalline lens becomes milky and cloudy. This causes partial or complete loss of vision.
b) Astigmatism - Vision becomes distorted when the surface of the cornea has an uneven curvature.
c) Dry eyes - deficiency of vitamin A can lead to complete blindness or dying corneas, which are characterized by marks called Bitot's spots.
d) Presbyopia (Ageing vision defect) - is a common defect of vision, which generally occurs at old age. A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively.
e) Myopia (short sightedness) - is a defect of vision in which a person clearly sees all the nearby objects, but is unable to see the distant objects comfortably and his eye is known as a myopic eye.
f) Hypermetropia (Long sightedness) - is a defect of vision in which a person can see distant objects clearly and distinctively, but is not able to see nearby objects comfortably and clearly.
Regards