What Prescription Is Legally Blind

A commonly asked question is what is a legally blind prescription. The answer is, depends what you mean by that question and where you are located. People with a legally blinf prescription are not blind, it just means they need a certain amount of visual correction in order to see. Legal blindness is defined by visual acuity and/or visual field criteria. In the United States, the legal definition of blindness, as established by the Social Security Administration (SSA), is a visual acuity of 20/200 or worse in the better eye with the use of corrective lenses, or a visual field limitation in which the widest diameter of the visual field is 20 degrees or less. In laymans terms, this means if your eyeglass frames prescription is -2.5 or higher, you are considered legally blind

Legally Blind Prescription

To understand what prescription is legally blind it helps to understand the meaning of visual acuity.

Visual acuity is a measure of the sharpness of vision. A visual acuity of 20/200 means that a person can see at 20 feet what a person with normal vision can see at 200 feet. It is considered a significant level of visual impairment. However, it’s important to note that the prescription (measured in diopters) associated with a specific level of visual acuity can vary among individuals due to factors like astigmatism, nearsightedness (myopia), farsightedness (hyperopia), and other refractive errors.

In other words, two people with the same visual acuity measurement may have different prescriptions based on the specific characteristics of their eyes. The prescription is typically determined by an eye care professional during an eye examination. If you have concerns about your vision, it’s important to consult with an optometrist or ophthalmologist for a comprehensive eye exam and prescription evaluation.

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