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I am sorry to hear you are worried about Romeo. My name is Rebecca. I am a veteinarian and will do my best to help.
What you see covering his eye is probably his third eyelid. It is a normal structure but you usually do not see it. If he is squinting and covering his eye with the third eyelid, he may have an eye injury, or infection. Is it just one eye, or both? If it is one, an injury is more likely.
I would consider this a possible emergency that should be checked by a veterinarian today, or tomorrow at the latest. I would be using a special dye to see if there is an injury or scratch on the cornea (clear covering of the eye) which may require eye drops, topical anesthetic for pain (holding the third eyelid over the eye is a sign of eye pain), or even oral pain medication.
There are no safe pain medications you can use in cats that are made for people except baby aspirin. A cat can take 1/2 of a baby or a low dose aspirin, but only once every 3 to 4 days. Tylenol is poisonous to cats.
Let me know what other questions I can answer.
No, do not do this. He is using his third eyelid for protection of his eye and it is OK for the third eyelid to cover it. He can move it out of the way whenever he wants to. Do not massage or touch his eye.
I would actually try a cool moist compress. You can try the 1/2 baby aspirin if you have it.
Yes, morning should be OK. He may have scratched himself with his nail; that is one possibility.
Only cool moist compresses, 1/2 baby aspirin (don't repeat for 3 to 4 days), and keeping him in a darkened room may help.
Let me know if this was helpful! And if you have any other questions I can answer.
Please let me know how he is doing, and if my answer was helpful.
I did not hear back from you. How is Romeo doing? Can I answer anything else? If this was helpful, please let me know.