Experts tell you: how much is normal vision? (1.0 = 5.0)?

Abstract: vision is not equal to diopter. There are fractional recording method, decimal recording method and logarithmic recording method. Decimal and logarithmic recording are mainly used in China. They can be converted. Vlog = 5 + LGV decimal. For example, 1.0 is recorded with logarithm, 5 + LG1 = 5.0. At present,

is commonly used in China. There are two kinds of visual acuity charts (decimal recording method and five point recording method). Many people are not very clear about the corresponding relationship between the two visual acuity charts. Today’s Xiaobian will teach you:

Visual acuity refers to how far objects can be seen under the premise of 1 point of view. No matter the fractional visual acuity chart, fractional visual acuity chart and logarithmic visual acuity chart are made according to this principle, Generally, 1.0 (fractional visual acuity chart, i.e. 5.0 of logarithmic visual acuity chart) is classified as normal visual acuity. Each person’s minimum visual threshold is different. It depends on the density of each person’s retinal pyramidal cells. When the density is large, the visual threshold is high and the minimum visual angle is smaller. Therefore, there are 3.0 (fractional visual acuity chart) or even higher visual acuity.

Therefore, vision is not equal to diopter. There are fractional recording method, decimal recording method and logarithmic recording method. Decimal and logarithmic recording are mainly used in China. They can be converted. Vlog = 5 + LGV decimal. For example, 1.0 is recorded with logarithm, 5 + LG1 = 5.0. Because everyone’s visual threshold is different, the national standard requirements for normal vision, Monocular vision is above 1.0 (5.0).

generally, normal naked vision can reach 1.0, that is, 5.0. For people with ametropia (myopia, hyperopia, astigmatism), naked vision will be lower than normal, but after wearing glasses, normal vision can be corrected to 1.0 (5.0). If the corrected visual acuity through glasses is still lower than normal, a comprehensive ophthalmic examination is required to see if the eyes have other diseases. If the corrected visual acuity of the eyes is lower than normal and everything is found to be normal, there is likely to be amblyopia. Amblyopia needs to be treated before the age of 6. If it is an adult, there is no treatment for amblyopia Yes. In general, when children go to kindergarten, they basically achieve normal vision. If children can’t achieve normal vision, they should go to the hospital in time to avoid missing the best treatment opportunity for eye diseases.

for simple ametropia eyes, If myopia correction surgery (including femtosecond laser surgery and ICL lens implantation surgery) is applied, the postoperative visual acuity should be normal. If amblyopia is accompanied, the postoperative visual acuity is still difficult to reach normal.

However, vision examination is a subjective examination, and there are some other factors that will also affect the examination results. Common factors affecting the accuracy of visual acuity examination are:

1. Light: old light box, substandard brightness of light source, scratched panel, dim light around the testing site, etc;

2. Environment: the surrounding environment is noisy and noisy;

3. Mood: poor mood will also affect the results;

4. Health: if you have a cold, fever or take medicine, your eyesight may also decline.

in order to protect the health of the eyes, you should go to the hospital for a comprehensive and formal examination in any case that causes vision loss. For ametropia, appropriate correction methods should be selected to obtain normal vision and ensure normal quality of life. Methods to correct ametropia include: frame glasses, contact lenses, refractive surgery, etc. You can choose the appropriate method according to everyone’s specific situation and under the guidance of professional doctors.