How many degrees of visual acuity is normal

Visual acuity refers to how far away an object can be seen under the premise of 1 point of view. Regardless of the fractional vision scale, decimal vision scale or logarithmic vision scale, they are all made according to this principle and generally classify the ability to see 1.0 (5.0 on the decimal vision scale, i.e. logarithmic vision scale) under 1 point of view as normal visual acuity.

Many people assume that if they can see at 1.0 or above they are considered normal. In reality, 1.0 vision only indicates that a person has partially normal vision. Strictly speaking, the criteria for normal vision also include the following.

  1. Central vision: This is the visual acuity that is determined by people usually checking their vision chart and includes distance vision (looking at the chart from 5 metres away) and near vision (looking at the chart at 30 cm). Patients with farsightedness show better distance vision than near vision; the opposite is true for nearsightedness. Patients with astigmatism have poor distance and near visual acuity. Normal central vision is only indicated when the distance and near visual acuity reaches 0.9 or more.

2. Peripheral vision: When the eye looks at a target, the range of the non-gaze area that can be seen is large or small, which is called peripheral vision, or what people often call ‘after-vision’. Generally speaking, a normal person has a fairly large peripheral vision range of 90 degrees on either side, 60 degrees above and 75 degrees below. Patients with myopia and night blindness have poorer peripheral vision, and some fundus diseases can also cause loss of peripheral vision.

If my vision is poor, can it be restored to normal?

Normally, normal bare eyesight is 1.0, i.e. 5.0. People with refractive errors (myopia, hyperopia, astigmatism) will have lower than normal bare eyesight, but this can be corrected to 1.0 (5.0) with glasses.

If the corrected vision is still below normal with glasses, a full eye examination is needed to see if the eye has any other disorders. If the corrected visual acuity of the eye is below normal and the eye examination reveals everything to be normal, it is likely that amblyopia is present. Amblyopia needs to be treated before the age of six to be effective.

For eyes with simple refractive error, with myopia correction surgery (including excimer laser surgery and intraocular lens surgery), the post-operative vision should be normal. However, patients with amblyopia may still have difficulty achieving normal vision after surgery.

In addition, you can exercise more during the day and wear eye massage equipment for deep relaxation of the eyes in your spare time, click to see our eye care devices. Alternatively, you can use herbal eye patches to relax and restore your eyes.

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