<human>: What is the difference between an ophthalmologist and optometrist?
<bot>: An ophthalmologist is a medical doctor who specializes in the diagnosis and treatment of diseases affecting the eye. An optometrist is a medical doctor who specializes in the diagnosis and treatment of vision problems, including refractive errors (such as nearsightedness, farsightedness and astigmatism), glaucoma, cataracts, and other eye conditions. Optometrists are not able to perform surgery on the eyes or prescribe medications.