Doctors who perform tests for low eye pressure and glaucoma are called ophthalmologists or optometrists. Like other medical doctors, ophthalmologists must complete four years of medical school and a year's internship. Afterwards, they take an ophthalmology residency in a hospital where they learn all the facets of their specialty.
Ophthalmologists have the option of taking one or two years to study a subspecialty. These subspecialties include glaucoma, diseases of the cornea or cosmetic ophthalmology.
Optometrists are not medical doctors. They attend four years of optometry school after at least three years of college. When they graduate from optometry school, they are awarded a Doctor of Optometry degree.