dolphins are not blind there vision is as sufisticated as humans however there is a small population of dolphins that are blind and are situated in the amazon river brazil due to enviromental factors
for extra information dolphins may become deaf if global warming continues and the reason for this is becuase with the increase tempreture of the oceans and the spaces between particles in the sea will increase allowing sound to travel easier meaning it would be louder and ultimatly cause dolphins to become deaf
There is only a small population of blind dolphins – almost all dolphins have amazing eyesight, actually, both above and below water. This is due to their being able to control the way light enters their eye with a crescent-shaped horizontal pupil – enabling them to essentially ‘turn off’ the central part of their pupil when above water. Dolphins can also see both monoscopically and stereoscopically, meaning they can focus on two separate images separately at the same time, as well as focus both eyes on one object.
The Ganges River dolphin, or susu, inhabits the Ganges-Brahmaputra-Meghna and Karnaphuli-Sangu river systems across India, Nepal, and Bangladesh. Although the dolphin’s eye lacks a lens, it uses the eye to locate itself, which is why it is sometimes called a “blind dolphin”. It swims on one side, trailing its fin along the river bottom to find food, which must be a peculiar site. Interestingly, the trait of blindness probably developed due to the murky conditions in the river it inhabits.
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