Red eyes when wearing keratoplasty lenses may be caused by dry eyes, conjunctivitis, keratitis and other reasons. 1. Dry eye: a disease that results in a lack of tears due to a decrease in tear production, which produces symptoms such as dry, itchy and uncomfortable eyes. Wearing keratoplasty lenses may aggravate the condition, resulting in congestion of the eyes and a strong sense of foreign body. 2. Conjunctivitis: If keratoconus is not cleaned up, it can lead to bacterial infection of the eyes, causing inflammation of the eyes and redness of the eyes. 3. Keratitis: If the cornea is infected due to keratoplasty, it can cause eye pain, eyelid spasm, ciliary congestion and other symptoms. It is recommended that those who wear keratoplasty lenses with red eyes should go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions to standardize the treatment.