(snel'ĕn )

Dutch ophthalmologist, 1834–1908.

S. chart A chart imprinted with lines of black letters graduating in size from smallest on the bottom to largest on top; used for testing visual acuity.

S. reflex Congestion of the ear on the same side upon stimulation of the distal end of the divided auriculotemporal nerve. SYN: auriculocervical nerve reflex.

S. test A test for visual acuity in which the patient reads a Snellen chart at a certain distance with one eye, then with the other eye, and then with both eyes.