There is no lens in the eyes (this species is also called a "blind dolphin"), but dolphins use their eyes to locate themselves.
Are blind dolphins really blind?
Where did the blind dolphin go? Ganges dolphins are almost completely blind. It has evolved in a silty and muddy environment for over 30 million years and has lost most of its eyesight. There is no lens in the eye and it can only detect the direction of diffused light. 25th. 2016
What is a blind dolphin?
Platanista gangetica, the biological name for the Ganges dolphin, also known as the "blind" river dolphin or "side swimming dolphin," is endemic to India and endangered species. 2016
Why are blind dolphins endangered?
The most direct cause is the use of nylon nets by fishermen. These freshwater dolphins are blind. They swim and find prey through echolocation – they send small sound waves, which tell their brain what's around them.
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