Which of the following are tests of the eye?
a. cephalgia, chondrodynia, sternotomy
b. myelography, photon absorptiometry, thermography
c. rheumatoid arthritis, muscular dystrophy, amyotrophic lateral sclerosis
d. exophthalmometry, keratometry, gonioscopy

The answer is letter D.

Exophthalmometry, keratometry, and gonioscopy are tests performed for the eyes. Exophthalmometry is used for measuring the degree of the forward displacement of the eye to the front of the cornea. Keratometry measures the corneal curvature or the power of the cornea determining astigmatism (how eyes react to light). Gonioscopy is a test that looks between the cornea and the iris to check where fluids of the eye drain out. These are all practices in medicine that determine the functions and abnormalities of the eyes and its different sections.