PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Eye examination. Doctor using a slit-lamp ophthalmoscope to examine a patient's eyes. This instrument shines a fine beam of light into the eye, and magnifying lenses allow the optician to explore the spot where the beam falls. Some serious eye disorders, such as glaucoma, are symptomless in the early stages and can only be detected through this type of eye examination.
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