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Eyestrain. Subjective symptoms of ocular fatigue, discomfort, lacrimation, and headaches arising from the use of eyes.

Age related macular degeneration: Destruction and loss of the photoreceptors in the macula region of the retina resulting in decreased central vision and, in advanced cases, blindness.

Device used to treat glaucoma (usually open angle) and diabetic retinopathy using a thermal beam.