Eye conditions may be divided broadly into 3 categories:-
1. Those disorders that affect the structure within the eye:
a. Total Retinal Dysplasia (TRD).
b. Progressive Retinal Atrophy (PRA).
2. Disorders associated with the eyelids:
3. Disorders that affect the “lubrication” mechanism of the eye.
a. Blocked Tear Ducts (Imperforate Lacrimal Punctum).
b. Dry Eye (Keratoconjunctivitis Sicca).
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