Low vision is not a normal symptom of aging. If you have noticed changes in your vision, see your eye doctor right away. Regular medical eye exams by an ophthalmologist are important to diagnose eye diseases early. It is important to treat those conditions that can be helped.
You will have a complete eye exam to diagnose low vision. The exam usually begins with questions about your medical history and any vision problems you might be experiencing. You will have tests designed to check your vision and check for eye diseases. Your doctor may use a variety of instruments and aim bright lights at your eyes. Your eyes will also be tested for visual acuity, or how well you see.
Low vision is a permanent loss of vision that won't improve with eyeglasses, medicine or surgery. If you have low vision, there is no treatment that will give you back your vision. Instead, you will need to learn new ways to use your remaining vision to complete everyday tasks and maintain your quality of life. Start the process of vision rehabilitation.
this article is excerpted from https://www.aao.org/eye-health/diseases/low-vision-diagnosis-treatment