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Has he been diagnosed with any post -operative complication following cataract surgery such as inflammation of the iris called as iritis/uveitis( characterise by redness,pain, photophobia , reduced vsion ) or corneal problem such as keratitis( similar symptoms as irits)?
If the post-op period was uneventful ( none of the above mentioned symptoms) then one has to look for the size of the pupil- a dilated pupil can cause such photophobia( intolerence to bright light). If the pupil too is of normal size and the vision in the operated eye too is fine, then he can try with lubricating eye drops so as to treat any associated dry eyes. But in case he has not had a follow up in the recent past ( after the onset of these symptoms) then it makes sense to get a follow up done by an ophthalmologist. A closer look at the cornea, tear film, iris and pupil will help to detect any likely cause for the photophobia.
In the meanwhile he can use lubricating eye drops such as over the counter preservative free Refresh tears eye drops , 1 drop 4 times a day for about a month.He can continue to use the prescription sunglasses.
Please feel free to ask follow up questions if any.
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