During an assessment of the eye, the optic nerve can be evaluated by:
1. Direct ophthalmoscope examination.
2. Using dilation eyedrops.
3. Shining a pen light into the eye.
4. A tonometer.
Direct ophthalmoscope examination.
Rationale: Direct ophthalmoscope examination is used to check the fundus of the eye, viewing through the pupil. The optic nerve can be visualized and should be checked for color, shape, and vessels. Dilation eyedrops are used for many diagnostic tests, but are not required to see the optic nerve with an ophthalmoscope. The optic nerve cannot be seen by shining a pen light into the eye. A tonometer is used to measure intraocular pressure.
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