The patient’s naked-eye visual acuity of 4.2 was below normal, but the degree of refractive error could not be accurately inferred from the patient’s naked-eye visual acuity.
Under normal circumstances, the naked-eye visual acuity of an adult should reach 5.0, and the current naked-eye visual acuity of 4.2 indicates that the patient has suffered from vision loss. However, since a variety of ophthalmic diseases can cause vision loss, it is not possible to determine whether the patient’s vision loss is caused by refractive error. Even if it is caused by refractive error, it is impossible to accurately estimate the degree of refractive error due to individual differences.
In addition to refractive error, cataracts, macular degeneration, and retinal detachment can also cause vision loss. If the patient wants to clarify the degree of refractive error, the patient needs to undergo an optometry examination.
It is recommended that patients with vision loss visit the hospital in a timely manner to assess their condition and undergo treatment under the guidance of a doctor.