20 6 Vision

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.

20 6 vision. At this testing distance the size of the letters on one of the smaller lines near the bottom of the eye chart has been standardised to correspond to normal visual acuity this is the 20 20 6 6 line. They do aim for 20 20 or 6 6 in europe i think because of the metric system because that is assumed to be average vision. It simply means you perform in the ballpark of what snellen considered normal. It is really just to do with feet and metres.

6 6 is used in countries that use metric units 6 meters while 20 20 is used in countries that use imperial units 6 meters 20 feet. This is because gp lenses can correct higher order. So the average normal vision in the general population would mean that what someone sees at twenty feet an average person can see. 20 ft 6 m decimal 4 m log mar 20 630 6 190 0 032 4 125 1 5 20 500 6 150 0 04 4 100 1 4 20 400 6 120 0 05 4 80 1 3 20 320 6 95 0 06 4 63 1 2 20 250 6 75 0 08 4 50 1 1 20 200 6 60 0 1 4 40 1 0.

6 6 vision is the same as 20 20 vision. In the united states this distance typically is 20 feet. In some cases if your best visual acuity is 20 20 6 6 with glasses it may be possible for you to see more clearly than 20 20 6 6 with gas permeable gp contact lenses. 20 20 vision 英語に係っていると 結構出てきます 20 20 は 視力 1 0 の事だというのが でもあまり説明を見かけないので書いてみました 関連ページ 米大統領 アメリカの祝祭日 ホーム 英語新館 20 20 vision.

In the uk it is 6 metres therefore 20 20 is equal to 6 6. Visual acuity is dependent on optical and neural factors i e 1 the sharpness of the retinal focus within the eye 2 the health and functioning of the retina and 3 the sensitivity of the. This blog post explains it all. As the american optometric association explains 20 20 vision isn t perfect vision.

You can also have a 20 20 score and low depth perception so you can. If your vision is easily correctable to 20 15 and that correction. You can have this score and still struggle to see things close to your face.