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If I am to understand correct, your question is whether removal of cataract will bring the intraocular pressure (IOP) down in the left eye , isn't it ?
Then the answer would depend on the cause of the raised IOP. Glaucoma can occur due to different causes and one of them is lens induced glaucoma (LIG). Only if a diagnosis of LIG has been established in your spouse's left eye, then a cataract removal surgery will help but not otherwise.
Suppose the glaucoma or raised IOP is due to some other reason ( other than LIG) then mere cataract surgery would not bring the IOP down.
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It was a pleasure to have answered this question. Views expressed are for information purpose only and cannot substitute a visit to an ophthalmologist