A surgical operation that cuts or opens the lens capsule of the eye, usually to treat cataracts or lens problems.
From capsulo- plus -tomy (from Greek tomē, 'cutting'). This surgical procedure emerged in the 18th-19th centuries as cataract surgery techniques developed.
A 'capsulotomy' is sometimes performed with a laser instead of a blade—the laser creates such a precise cut that a surgeon can open the capsule and remove a cloudy lens without damaging the surrounding eye tissue, which is like removing a cataract with a light beam.
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