Yes, a 75 astigmatism is considered a severe case. Astigmatism is a refractive error of the eye, which means that the eye has difficulty focusing light. It occurs when the cornea has an irregular shape or curvature, causing light to be focused unevenly on the retina. The severity of astigmatism is determined by its dioptric power, which is measured in diopters. A 75 astigmatism is considered severe because it has a power of at least 4.0 diopters. This means that the shape of the cornea is significantly distorted and the eye is unable to focus light properly.
Patients with a 75 astigmatism may experience symptoms such as blurred vision, difficulty seeing at night, headaches, eyestrain, and difficulty reading. They may also be more prone to developing other vision problems, such as nearsightedness or farsightedness, which can further affect vision. Treatment for a 75 astigmatism typically involves corrective eyewear, such as glasses or contact lenses, which can help the eye focus light correctly. In some cases, surgery may be recommended to correct the shape of the cornea.
Overall, a 75 astigmatism is considered severe and should be treated as soon as possible to prevent further vision problems.