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You appear to be describing a lens-induced glaucoma - increased intraocular pressure. Our primary concern is that glaucoma blinds but in this case the concern has to be that glaucoma is quite painful - at least until the increased pressure kills the nerves responsible for perceiving pain. I recommend that an ER vet attend to this eye at your earliest convenience. Medication may be prescribed for the other eye as well in an attempt to prevent glaucoma from developing in that eye. Please respond with further questions or concerns if you wish.