To test distant vision, the distance of the patient from the vision table is mainly 5 meters, usually the patient directly faces the vision table to measure vision, the distance is 5 meters, if the patient is facing the mirror to measure vision, the distance from the mirror is 2.5 meters.
The distance of testing vision, the domestic standard test is 5m away from the vision table, generally refers to the environment is quiet, natural light, light source is sufficient, both eyes look directly at the vision table distance of 5 meters.
In some cases, due to distance limitations and other circumstances, hospitals or optical stores choose to put a mirror opposite the visual acuity table, sitting under the visual acuity table, the mirror is placed at a distance of 2.5 meters away from the person to measure the visual acuity through the mirror’s reflection of the light to measure the visual acuity, the actual distance is also 5m.
It is recommended that patients with abnormal vision tests should seek medical attention in time to assess their condition and follow the doctor’s instructions for treatment.