As I am sure you can appreciate, the website appears to have been having some issues over the past day. If you do have an opportunity to let me know the answers to the questions above, it will give me a better idea of your situation.
If all the cats show these signs intermittently or show coughing/sneezing/discharges, then you are problably looking at respiatory disease in these kitties. It is very common in outdoor cats and very common to see it passed from mother to kittens.
But if we consider ocular issues with her at the moment, there are a wide range of possible causes of a raised third eyelid in the cat. Often we se this associated with squinting (called blephrospasm) or swelling of the conjunctiva (the pink tissue around the eye). Together these signs tell us that there has been a “trauma” to the eye. Common traumas that will induce of a raised eyelid in a cat include bacterial, viral, external toxin exposure, and mechanical traumatic agents (foreign material, sand, grass,etc).
Now with the third eyelid comes up to protect the eye from further damage, but it also makes it difficult to appreciate the extent of what might be going on with the eye. As well, if the eye has gotten scratched by foreign material, we do often see the material caught under the third eyelid where it can cause even further damage.
If you are sure there is nothing caught under the third eyelid and there is no sign of corneal ulceration, then you can soothe mild bacterial infections by salt water bathing the eye (with 1tbsp salt to a pint of warm water). This will act as a mild antiseptic and can help settle mild irritation. But if you find that the eye isn’t settling in the next 24-48 hours, then you will need to have your vet evaluate the eye.
As eyes are so delicate, prompt treatment is always important. If you see your vet, they will be able to examine the eye, determine the cause of what we are seeing, and provide antibiotic cover if needed. Often eyes do need this support, since corneal trauma can be quite at risk of secondary infection. The vet will also be able to stain the eye with fluorescein, so that the area of damage can be appreciated. Additionally, they will be able to provide some pain relief for this wee kitty, she sounds like she is coping well but ulcerated eyes can be quite sore and unpleasant for them.
I hope this information is helpful. Please let me know if you have any further questions. If you have no further questions, I would be grateful if you would press the wee green accept.