Eye vision of 4.2 is not normal.
Under normal circumstances, the naked eye vision should reach 5.0, the current visual acuity of 4.2 indicates that there is a loss of vision, which is abnormal, the patient should consult a doctor to find out the cause, the common causes are refractive error, cataract, fundus lesions and so on.
Refractive error can be diagnosed through optometry, and can be corrected through glasses or refractive surgery.
Cataracts can be diagnosed by slit lamp microscopy and usually require surgical treatment to improve vision, such as cataract aspiration with ultrasonic emulsification combined with IOL surgery.
Patients with fundus lesions need to undergo detailed fundoscopy and OCT to confirm the diagnosis and adopt appropriate treatments according to different types of lesions. For example, patients with macular degeneration can consider intravitreal injection of anti-VEGF drugs such as Compazine and Abciximab.
Patients with vision loss of 4.2 should consult the ophthalmology department of the hospital in a timely manner, so that the doctor can find out the cause and guide the treatment.