Many people refer to 'perfect' vision as '6/6' or '20/20' (US notation measured in feet), but this is not strictly true – these terms refer to 'average' vision. If you achieve a vision measurement of 6/6, this means that you can see at a distance of 6m what an average person also sees at the same distance.
A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart.
Are Eyeglasses needed if you have 6/6 VIsion? Someone with 6/6 vision has normal eyesight with good clarity and sharpness. However, if you need to be on the computer for extended periods of the day, you may benefit from blue-light blocking glasses from zFORT®. Blue light is a potentially harmful form of light.
6/6 means you see at 6 metres what an average person can see at six metres, and 20/20 is the equivalent in feet, twenty feet versus twenty feet. So the average normal vision in the general population would mean that what someone sees at twenty feet an average person can see.
The ability for a person to read or see the last line on the visual chart is recorded (at a test distance of 20 feet or 6 metres) and defined by terminology 6/6 vision (normal), 6/9 (one line less than 6/6), 6/12 (2 lines less than 6/6) etc.
Legal blindness is defined as someone with less than 6/60 vision.
6/6 visual acuity is normal vision. 6/5 represents the fortunate 10 percent of the population that has better than normal vision.
To meet the minimum eyesight standard for driving you must also have a visual acuity of at least decimal 0.5 (6/12) measured on the Snellen scale (with glasses or contact lenses, if necessary) using both eyes together; or, if you have sight in one eye only, in that eye.
20/10 vision is thought to be the maximum visual acuity of human eyes without binoculars or other magnifying devices. Recent advances in optics have led to the creation of corrective lenses that can provide this ultra-sharp vision.
What is the normal visual acuity? 20/20 is considered normal visual acuity. If you have 20/20 vision, it means that you can see objects clearly from 20 feet away. This is expressed as 6/6 in metric, 1.00 in decimal, and 0.0 in LogMAR measurement.
This line, designated 6/6 (or 20/20), is the smallest line that a person with normal acuity can read at a distance of 6 metres.
Someone who has 'normal' vision has 6/6 visual acuity – they can see the bottom/second bottom line of a Snellen chart (pictured). If you have 6/60 visual acuity, it means that you can see at 6 metres. Others with normal acuity can see from 60 metres.
A nearsightedness of 0.50 will make people with myopia see a bit more blurred, but there are many people who still see well at this level without wearing glasses. The degree of myopia 0.75 degrees is the level of myopia that the patient should start wearing glasses to avoid affecting daily work.
-3.00 to -6.00 diopters is moderate. -6.00 to -9.00 diopters is severe. -9.00 diopters or more is extreme.
A Va of 6/4 means that at 6m, the smallest letter you can see can be seen by somebody with '20/20′ vision at 4 metres. Hence, 6/4 acuity is better than 6/6.
20/30 to 20/60, this is considered mild vision loss, or near-normal vision. 20/70 to 20/160, this is considered moderate visual impairment, or moderate low vision. 20/200 or worse, this is considered severe visual impairment, or severe low vision.
Unfortunately, eyesight cannot be improved naturally and there is no way to change a refractive error, such as myopia, hyperopia, astigmatism, or presbyopia. These types of visual conditions can be treated with glasses, contact lenses, or refractive surgery. However, there can be other reasons for diminished eyesight.
Eagles and hawks are thought to have the sharpest vision in the animal kingdom and some species have the equivalent of 20/2.5 eyesight, which means they can make out small details up to eight times further away than humans can, enabling them to spot a meal three kilometers away.
Depending on your eyesight condition, your eye health professional will assess your eyesight and advise whether you meet the requirements and how your eyesight condition should be managed. Visual acuity of 6/9 or better in your best eye and 6/18 or better in your worst eye, with or without glasses or corrective lenses.
While there's no "bad" eye prescription, you can be "legally blind" when your prescription is 20/200 or worse. Different diseases can cause bad eyesight, some treatments can help improve your vision.
Astigmatism is a common eye problem that can make your vision blurry or distorted. It happens when your cornea (the clear front layer of your eye) or lens (an inner part of your eye that helps the eye focus) has a different shape than normal. The only way to find out if you have astigmatism is to get an eye exam.
Someone with 6/12 vision may have normal vision without eyeglasses. Although it is rare. Whereas someone with 6/6 may need eyeglasses. So 6/6 does not mean perfect vision and they may need eyeglasses.
If you score 6 / 6, it means you are able to see things located 6 metres away. This is considered to be the normal condition. 6 / 9 denotes that you are seeing objects from 6 mtrs, which are normally seen by a person who is at 9 mtrs.It implies that your vision is slightly below the normal condition.
Corrected (with glasses or contact lenses) or uncorrected visual acuity must be better than 6/9 in the best eye and at least 6/18 in the worst eye.