Visual acuity of 1.0 is within the range of normal vision, but one should not rely on this indicator alone to assume that the eye is normal, but should also combine it with other tests and physical findings to make a clear diagnosis. Visual acuity 1.0 usually refers to monocular vision, which allows a person to obtain a clear image of an object. Visual acuity includes both central vision and peripheral vision. Only if the central vision is 1.0 and the peripheral vision is normal, the eye can be considered normal; if only the central vision is 1.0 the test result is not comprehensive. For example, some patients with glaucoma can have a visual acuity of 1.0, but the peripheral visual field is small and appears as a tubular field. This shows that visual acuity of 1.0, along with other eye examinations, is required for diagnosis. Visual acuity 1.0 is one of the criteria to determine whether the eyes are normal. If the visual acuity does not reach 1.0 after a visual acuity examination, a comprehensive examination should be performed to clarify the cause of vision loss and take symptomatic treatment for the cause.