If you're not familiar with entropian, just know that it is the most common problem with Shar Pei eyes, along with Primary Open Angle Glaucoma (POAG) and Primary Lens Luxation (PLL). When the eyelid rolls inwards towards the eye, eyelashes rub the cornea, which leads to irritation and to ulcers. The dog will rub its eyes or won't open them. It is very painful. If not treated, it can result in blindness.