OD - Abbreviation for oculus dexter - right eye, OS - Abbreviation for oculus sinister - left eye, OU - Abbreviation for oculus uterque - both eyes, Myopia - Nearsightedness, defect in distant vision, Hyperopia - Farsightedness, defect in close vision, Ophthalmoscope - Instrument for checking the eye, Tonometer - Instrument to measure intraocular tension or pressure; increased pressure often indicates glaucoma., Snellen Charts - An item used for vision screening containing letters or pictures., Snellen Chart for children - Chart with pictures, Snellen Chart for non-english speaking individuals - Chart with the letter E pointing in different directions., Snellen Chart for English language readers - Chart with a variety of letters,

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