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Your present ophthalmologist is right in suggesting you to undergo a laser peripheral iridotomy (Laser PI) considering that you are far sighted. Individuals who are far sighted have shorter length of eye ball and small intraocular structures as compared with normal emmetropic ( no refractive error) individuals. Hence they have a narrow angle with a risk of angle closure glaucoma. Dilating the pupil can lead to an acute episode of angle closure glaucoma. To prevent such an episode it is always better to do a laser PI prior to dilating the pupil. It is a safe office procedure and is not painful.
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