Certified Paraoptometric (CPO) Practice Exam

The correct answer is A. Binocular indirect ophthalmoscope. This instrument is worn on the examiner's head and allows the examiner to view the back of the eye, specifically the retina and optic nerve, by directing a beam of light into the patient's eye. This tool is particularly useful for assessing the health of the optic nerve, detecting abnormalities in the retina, and monitoring conditions such as diabetic retinopathy or macular degeneration.

The other options are not the correct answer:

B. Slit lamp is used to examine the anterior segment of the eye, not the back of the eye.

C. Retinoscope is used to determine the refractive error of the eye by assessing how light is reflected off the retina, not for viewing the back of the eye.

D. Phoropter is a device used to measure refractive error and determine the appropriate prescription for glasses, but it is not worn on the examiner's head or used to view the back of the eye.