A patient is having an eye examination. The ophthalmologist is looking inside the patient's eye with a hand-held instrument. What instrument is he using to perform this procedure?
A) A slit lamp
B) An indirect ophthalmoscope
C) An Ishihara plate
D) A direct ophthalmoscope
Ans: D
Feedback: A direct ophthalmoscope is a hand-held instrument with various plus and minus lenses. The lenses can be rotated into place, enabling the examiner to bring the cornea, lens, and retina into focus sequentially. Ishihara polychromatic plates are used to test color vision. The slit lamp is mounted on a table and enables the user to examine the eye with magnification of 10 to 40 times the real image. The indirect ophthalmoscope produces a bright and intense light. The light source is affixed with a pair of binocular lenses mounted on the examiner's head. The ophthalmoscope is used with a hand-held, 20-diopter lens.
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