Concept of refractive naked eye vision

Abstract: diopter is commonly known as myopia. “The visual acuity decline of most young students is mostly related to fatigue caused by close eye use, mostly due to adjustment disorders and eventually organic lesions (that is, the anterior and posterior diameter of the eyeball has changed, that is, exophthalmos).

naked eye vision:

In short, it is the vision measured by taking off the glasses through the vision test table, that is, people’s ability to see things clearly. The quality of vision is judged by the distance of seeing the objects. The good ones are 1.5 and 2.0, and the poor ones are 0.1, immediate finger discrimination and light perception (that is, people can’t see the objects clearly, but can only feel the existence of light). As long as a person’s vision is normal, no matter whether his refraction is myopia or hyperopia, he can’t be said to be myopia, hyperopia or amblyopia. For example, vision 1.0 Degree – 50D).

myopia degree:

diopter is commonly known as myopia degree. “The visual acuity decline of most young students is mostly related to fatigue caused by close eye use, mostly due to adjustment disorders and eventually organic lesions (that is, the anterior and posterior diameter of the eyeball has changed, that is, the exophthalmos of the eye).” refraction “generally refers to the change of the optical path of parallel light, For the eyes, the most direct refractive change is reflected in the curvature of the lens. The closer the vision is, Curvature of lens The larger the (thickness), the harder it is to adjust. The first self feeling is eye fatigue, that is, the symptom of too long reading time at a close distance; the lens is the most direct adjustment structure for the human eye to see far and near, which is equivalent to a convex lens. It can adjust its bending degree according to its own needs to change the distance of the focus, so as to see the object clearly. The integrated understanding of

and

is that naked eye vision refers to the ability of our fundus retinal imaging; Myopia refers to the diopter of our cornea, Diopter refers to the power of the whole refractive system of the eye (cornea, aqueous humor, lens, vitreous) is usually expressed by the degree of the eye. Generally, 1.0 of the visual acuity chart at a distance of 5 meters is the minimum degree requirement, and the degree is only an indicator of the specific curvature of a state specified for people to see the visual object. If the position is changed, there will be different requirements and values, such as the visual object at a distance of 5 meters and the visual object at a distance of 3 meters Degrees are different.