Cataract can be monolateral?

Yes: Although the majority of patients who have cataracts have them in both eyes, there are plenty of people who have a unilateral (in one eye only) cataract. The reason is not always apparent but trauma may play a role.

Yes: Typically it there is equal amount of cataract in both eyes. But one eye may be more significant than the other eye. Especially in a case with trauma to that eye.

Unilateral: Yes, cataracts can occur only in 1 eye or be worse in 1 eye more than the other: can be due to genetics, trauma, diabetes. More info at eyedoc2020@blogspot.com

Yes: Most cataracts, especially in the elderly are bilateral. But you can get a cataract from birth defects, trauma and disease of one eye which therefore appears only in that eye. When one of these appears in my office, I always ask about the history of that eye for clues.

Cataracts will…: develop and everyone because this is part of the natural aging process. However there are some people whose cataracts develop earlier than others and this can be asymmetric, meaning one is much much worse than the other.