The cylindrical eye has the medical term astigmatism. The term refers to the condition of the eyes that have blurred and shaded vision because the shape of the cornea or lens is not completely convex. The most common signs and symptoms felt by people with cylindrical eyes are blurred or shaded vision. Patients become often squinting when looking far or near. In addition, sufferers usually complain of difficulty reading small writing. Other symptoms that are often complained of are headaches, eye strain, and fatigue after reading or using a computer. In mild cylindrical eye disorders, vision problems may not occur significantly. Unfortunately, if the cylinder eyes are suffered by children, they will most likely not realize it. This might happen because children's knowledge about an object is not perfect. In children, the symptoms of a cylindrical eye can be the difficulty they focus on writing in the book they are reading. They may also experience headaches, fatigue, and eye str