What is the best visual acuity with the naked eye?

The best visual acuity with the naked eye is 2.0, or 5.3.

Generally speaking, corrected vision refers to the vision after wearing glasses. Vision measured without glasses is called naked eye vision.

For example, a myopic patient's visual acuity without glasses is 0.1, but with glasses the visual acuity reaches 1.5, the former is called naked eye vision, and the vision after wearing glasses is called corrected vision.

The test range of the 5-point visual acuity chart is 4.0 to 5.3, and the test range of the decimal visual acuity chart is 0.1 to 2.0.

Extended information:

Our country has chosen the "E list". The main reason is that the "E list" is suitable for people who cannot read Latin letters smoothly, and it is also suitable for people whose mother tongue does not use the alphabet. crowd.

At the Ninth Congress of the Chinese Medical Association held in 1952, the Chinese Medical Association recommended the "International Standard Eye Chart" ("E Chart") drawn by Professor Sun Jizhong, which has since become a national standard. Come on.

Another important benefit of the "E table" we use is that it has a certain grid structure, which is helpful for testing astigmatism. For example, if someone can clearly identify the left and right E, but has difficulty identifying the upper and lower E, it can be reasonably suspected that he may have a certain degree of astigmatism.

Baidu Encyclopedia - Vision Chart

Baidu Encyclopedia - Naked Vision