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What is the difference between blindness and cataract?

What is the difference between blindness and cataract? Correct Answer Cataract is clouding up of the cornea while blindness happens if either retina, optic nerve or the occipital lobe is injured or damages

Cataract is a physiological problem that occurs due to old age while blindness is mostly a neural problem. A person who is blind, either their light receptors, i.e. rods and cones are not functioning or the nerve that will carry the impulses to the brain, i.e. the optic nerve is not functioning or the occipital lobe which is the receptor lobe for eye impulses has been damaged.

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The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the mostlogical order of sentences from among the options.
P: Modern medicine has scored significant victories against both, and the major causes of ill health and death are now the chronic degenerative diseases, such as
coronary artery disease, arthritis, osteoporosis, Alzheimer's, macular degeneration, cataract and cancer.
Q: It follows that the majority of apparently healthy people are pre-ill.
R: Throughout human history the leading causes of death have been infection and trauma.
S: These have a long latency period before symptoms appear and a diagnosis is made.