Answer to Question 1
C
Explanation: The meanings of the other suffixes are: -penia, deficiency or reduction in number; -pepsia, digestion; and -pathy, disease.
Answer to Question 2
C
Explanation: XT stands for exotropia, a pathological condition. VA stands for visual acuity, a diagnostic test. PRK stands for photorefractive keratectomy, a surgical procedure. OD stands for right eye.