Hi, I have two guinea pigs Lola and Coco. They are both 4 1/2. I just noticed one of my guinea pigs eye has crust all over it, and looks really cloudy, like theirs a film over it and is sunken. When I put up to the light to take a closer look her bad eye reflected blue and Lola's other eye is perfectly fine. She isn't acting any different shes eating and drinking just fine so I'm assuming that it may just be vision loss due to her older age but i just want your input on this situation.