The term "cylinder eye" refers to an eye condition where the shape of the cornea is irregular, creating a distorted or blurry vision. There are several synonyms that are used to describe this condition. One common synonym is "astigmatism," which is a condition where the eye has difficulty focusing on objects at any distance. Another term used for cylinder eye is "toric lens," which is a type of contact lens made to correct astigmatism. "Oval eye" is sometimes used as a synonym for cylinder eye because the cornea can take on an oval shape in this condition. Similarly, "irregular cornea" or "corneal irregularities" are other phrases to describe cylinder eye.