At values +0,25 to +3,0
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.
-3.00 to -6.00 diopters is moderate. -6.00 to -9.00 diopters is severe. -9.00 diopters or more is extreme.
Mild: -0.50 to -3. Moderate: -3.25 to -5.00. High: -5.25 to -10. Extreme: greater than-10.
In the United States, a person is considered legally blind if they have, vision cannot be corrected to better than 20/200 in the best eye or 20 degrees or less of their peripheral visual field remaining.
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.
An individual who cannot see 20/200 or better is considered legally blind.
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.
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.
20/30 to 20/60 vision in the better eye, even with correction glasses, is considered mild vision loss or mild low vision. 20/70 to 20/130 vision is moderate low vision. 20/200 to 20/400 is severe low vision. If you suspect that you may have vision impairment, it's always best to consult with an eye specialist.
In the United States, legal blindness means your central visual acuity—the part of your vision that allows you to see straight ahead—is 20/200 or less in your better eye when wearing corrective lenses.
A -5 eye and a -7 eye are not much differently at risk, but both are significantly more at risk of retinal problems than a more normal, non-myopic eye. These are rare, though, so no cause for alarm.
What is legal blindness? 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.
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.
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.
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.
The maximum negative eye power is typically around -20 diopters. This means that if you have myopia of -20 diopters, you will need to wear glasses or contact lenses with a power of -20 in order to see clearly.
Legal blindness is defined as someone with less than 6/60 vision.
While there is no guarantee that a sudden change in vision will cause blindness, ignoring sudden vision changes highly increases the likelihood that you will go blind. We cannot stress this enough: If you experience rapid changes in vision quality, see a doctor as soon as possible.
If you are legally or totally blind, you may be considered disabled and qualify for Social Security Disability Insurance (SSDI). When you are eligible for these benefits, you may also be able to continue to work and receive more income than if you were disabled due to another medical condition.
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.
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.