What is the diopter value for a vision of 5.0?
I had my vision checked today. Recently, I've felt that my vision is quite clear, with no problems reading the blackboard or road signs. My measured vision is 5.0, and I would like to know what this vision level corresponds to in terms of diopters.
Doctor's answer (1)
Under the five-point recording system, a vision score of 5.0 corresponds to 1.0 in the decimal recording system, indicating normal vision. The eye refraction level associated with this vision is approximately 0 diopters, or possibly mild myopia, hyperopia, or astigmatism within 100 diopters.
It's important to clarify that the expressions "vision 5.0" or "1.0" do not directly correspond to the degree of myopia or hyperopia. Vision refers to an assessment of the eye's ability to recognize object clarity, while diopters reflect the degree of abnormal refraction in the eye, usually measured in diopter (D). For example, -2.00D indicates 200 degrees of myopia, and +2.00D indicates 200 degrees of hyperopia.
Although vision of 5.0 is defined as normal, due to individual differences among people and variations in ocular tension and fatigue, changes in refractive error may occur due to accommodative mechanisms of the eyes. Therefore, if myopia, hyperopia, astigmatism, or similar conditions are suspected, it is recommended to undergo refraction testing, atropine cycloplegia, and other examinations at the ophthalmology department of a formal hospital to determine the eye's refractive error accurately.
