With 1000 diopters, it depends on the type of refractive error to determine if it can be treated surgically. 1000 diopters of myopia can be treated by laser surgery or posterior chamber IOL implantation in crystalline eyes, while 1000 diopters of astigmatism or farsightedness can not be treated by surgery. Refractive errors can be categorized as myopia, hyperopia, and astigmatism, and their severity is determined by the number of diopters. 1,000 diopters of myopia, hyperopia, or astigmatism are more serious, but only 1,000 diopters of myopia can be corrected by laser surgery or posterior chamber IOL implantation in crystalline eyes. For astigmatism of 1,000 diopters and hyperopia of 1,000 diopters, surgery is no longer possible, and patients may be considered to wear rigid contact lenses or frames to correct them. The decision of whether or not surgery is possible will be made by the doctor after an in-person examination.