Ophthalmologist (noun)

1. A medical doctor who specializes in the diagnosis and treatment of eye disorders.
2. A specialist in the medical and surgical treatment of eye problems.

Origin:

The word "ophthalmologist" is derived from the greek word "ophthalmos" meaning "eye" and the greek word "logos" meaning "study of", it refers to a medical doctor who specializes in the diagnosis and treatment of eye disorders.

Examples:

1. She went to see the ophthalmologist because she had a problem with her vision.
2. He is an ophthalmologist and specializes in the treatment of glaucoma.
3. The ophthalmologist examined her eyes and prescribed new glasses.
4. An ophthalmologist can perform eye surgery to correct certain vision problems.
5. She took her child to see the ophthalmologist because of a problem with his eyes.