Step 1 : Introduction to the question "10. A person whose eyesight is extremely weak, might be called as blind as a ____."
...1. Mussel 2. Beaver 3. Bat 4. Mole The eyesight of moles is highly dubious but it's bats that caught our attention as 'blindfliers'. With all that salty seawater there can be little use for a pair of eyes in the anatomy of a mussel, but good eyesight does not seem to be a major requirement for a mollusc, either.
