Mild: -0.50 to -3. Moderate: -3.25 to -5.00. High: -5.25 to -10. Extreme: greater than-10.
If your prescription is -2.5 or lower, this means that you are legally blind. Visual acuity of -2.5 is equivalent to 20/200 vision. Visual acuity of -3.0, for instance, means that you have 20/250 or 20/300 vision. From there, visual acuity of -4.0 means that you have 20/400 vision.
Normal: 20/10-20/25. Near Normal visual impairment: 20/30-20/60. Moderate visual impairment: 20/70-20/160. Severe visual impairment: 20/200-20/400, or 11-20 degrees on the visual field.
Legal blindness means that your visual acuity is worse than 20/200 or a visual field that is less than 20 degrees even with the best possible correction. In order words, if your prescription is -2.5 or lower, this means that you are legally blind.
If your number is between -0.25 and -2.00, you have mild nearsightedness. If your number is between -2.25 and -5.00, you have moderate nearsightedness. If your number is lower than -5.00, you have high nearsightedness.
If you're legally blind, your vision is 20/200 or less in your better eye or your field of vision is less than 20 degrees.
Your visual acuity would be less than 6//60 (20/200), so would be legally blind without correction.
What prescription is considered legally blind? Legal blindness is defined as 20/200 vision. 14 The prescription equivalent is -2.5. It is important to note that prescriptions for corrective lenses are different for each person, and measurements can be different for each eye.
Legal blindness
Someone is considered to be legally blind when: visual acuity is 20/200 (or 6/60) or less in both eyes after correction, and/or. a visual field of 20 degrees or narrower.
A refractive error greater than -6 is when an optometrist might diagnose high myopia in a patient. Low myopia can have a refractive error as low as -0.25, while moderate myopia caps out at -5.75. If left untreated and with age, high myopia can progressively worsen to a greater degree of refractive error.
A lens Rx for -14 Diopters tells us you have a very, very high degree of nearsightedness (myopia). This would be considered in the "severe" range. Of all the people who are myopic, less than 2% are worse than -10 Diopters.
In order to be legally blind, you must have a visual acuity of 20/200. This means that even with glasses or contacts, you can only read the first letter at the top of the Snellen Chart, if that. You can also be legally blind if you can see, but only in a very small window in your eye.
Visual acuity less than 20/200 is considered legally blind, but to actually fit the definition, the person must not be able to attain 20/200 vision even with prescription eyewear. Many people who would be legally blind without eyewear can function well in everyday life with appropriate glasses or contact lenses.
-3.00 diopters or less is mild. -3.00 to -6.00 diopters is moderate. -6.00 to -9.00 diopters is severe. -9.00 diopters or more is extreme.
If your prescription is -2.5 or lower, you are legally blind, as visual acuity of -2.5 is equivalent to 20/200 vision. Another thing to consider when having 20/200 or less visual acuity is whether or not it can be improved with contact lenses or glasses.
Mild: -0.50 to -3. Moderate: -3.25 to -5.00. High: -5.25 to -10. Extreme: greater than-10.
Visual acuity less than 20/200 is considered legally blind, but to actually fit the definition, the person must not be able to attain 20/200 vision even with prescription eyewear. Many people who would be legally blind without eyewear can function well in everyday life with appropriate glasses or contact lenses.
First: What does it mean to be "legally blind?" In most states, if you have distance visual acuity less than 20/200 that is not correctable with glasses/contact lenses, you are legally considered to be "severely visually handicapped" (which used to be called "legally blind").
The highest level of corrective power for monthly soft contact lenses is about -12 Dioptres (bear in mind that the average prescription for short sighted people is -2.00 Dioptres), and is available from both Purevision 2HD and Biofinity.
Part 1 of the U.S. definition of legal blindness states this about visual acuity: A visual acuity of 20/200 or less in the better-seeing eye with best conventional correction (meaning with regular glasses or contact lenses).
This is the basis for the “legal blindness definition. Legal blindness is defined as: 20/200 or worse vision in the better seeing eye, or less than 20° of a field of vision.
A person is considered legally blind if they cannot see at six metres what someone with normal vision can see at 60 metres or if their field of vision is less than 20 degrees in diameter.
If you're interested in cutoffs between moderate and severe kinds of vision issues, we can tell you that nearsightedness needing a refractive correction of -5 diopters or more is often considered “high myopia,” whereas a prescription reading +5.25 diopters fits the bill for “high hyperopia.” However, these scales can ...