I think an optometrist? Not sure.
Someone who studies the human body is called an anatomist or a biologist specializing in human anatomy.
A virologist is someone who studies viruses, including their structure, classification, evolution, and interaction with host cells. They also study how viruses cause disease and how to prevent and treat viral infections.
Someone who studies evolution is called Evolutionary Biologist.
Someone who studies cryogenics is called a cryogenicist.
florist
You call someone that studies metal a metallurgist.
A physicist.
a person who studies planets is a planetologist.
florist
Microbiologists
An Anthropologist.
malacologist
A Zoologist
Brocollogist
A physicist.
Musician.
euclidist