The puncture of a cataract with a needle.
A form of capsulotomy in which a sharp needle is used to make a hole in the capsule surrounding the lens of the eye.
An operation performed in the treatment of cataracts, in which the anterior lens capsule of the eye is opened with a needle, allowing the aqueous fluid to dissolve the opaque soft lens matter, which is gradually washed away into the bloodstream. This ‘extra-capsular extraction’ may need to be repeated several times before all the opaque lens matter disperses. Although a relatively simple procedure, it is unsuitable for patients over the age of 35 (when the nucleus of the lens becomes increasingly hard), and cryosurgery and laser therapy have become the preferred methods of treatment.