Nearsightedness, also known as myopia, is the most common type of refractive error. It occurs when the eyeball is too long or the cornea is too curved, causing light to focus in front of the retina instead of on it.

Farsightedness, also known as hyperopia, is the opposite of nearsightedness. It occurs when the eyeball is too short or the cornea is too flat, causing light to focus behind the retina instead of on it.

Astigmatism is a condition in which the cornea or lens is not perfectly round, causing light to focus in more than one place on the retina.

Presbyopia is a condition in which the lens of the eye becomes less flexible, making it more difficult to focus on nearby objects.

Refractive errors can cause a variety of symptoms, including blurred vision, double vision, headaches, and eye strain.

Refractive errors are diagnosed through a comprehensive eye exam, which includes a refraction test and a dilated eye exam.

Refractive errors can be corrected with eyeglasses, contact lenses, or laser eye surgery.

LASIK is the most common type of laser eye surgery. It involves using a laser to reshape the cornea, the clear front cover of the eye.

Laser eye surgery can cause a variety of side effects, including dry eyes, glare, and halos.

Laser eye surgery is a good option for people who are nearsighted or farsighted, have astigmatism, are over the age of 18, and have healthy eyes.

The recovery time from laser eye surgery is typically a few days.

The success rate of laser eye surgery is typically 95-100%.

The alternatives to laser eye surgery include eyeglasses, contact lenses, and implantable contact lenses.

There is no way to prevent refractive errors, but getting regular eye exams can help to diagnose and correct them early.

Refractive errors are a common vision problem that can be diagnosed and corrected. If left untreated, they can lead to serious eye problems.