An examiner is using an ophthalmoscope to examine a patient's eyes. The patient has astigmatism and is nearsighted. The use of which of these techniques would indicate that the examination is being correctly performed?
a. Using the large full circle of light when assessing pupils that are not dilated
b. Rotating the lens selector dial to the black numbers to compensate for astigmatism
c. Using the grid on the lens aperture dial to visualize the external structures of the eye
d. Rotating the lens selector dial to bring the object into focus
ANS: D
The ophthalmoscope is used to examine the internal eye structures. It can compensate for nearsightedness or farsightedness, but it will not correct for astigmatism. The grid is used to assess size and location of lesions on the fundus. The large full spot of light is used to assess dilated pupils. Rotating the lens selector dial brings the object into focus.
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