If you don't have access to an eye doctor or are unable to schedule an eye exam, there are a few things you can do to determine your approximate reading glasses strength:
Hold a small print book or magazine at arm's length and gradually move it closer to your face until the print becomes clear. The distance at which the print becomes clear can be used to estimate your reading glasses strength.
Try different strengths of over-the-counter reading glasses. Many drugstores, supermarkets, and online retailers sell reading glasses in a variety of strengths, usually ranging from +1.00 to +3.50 diopters. Try on different strengths and see which ones allow you to read small print most clearly.
Ask a friend or family member for help. Have someone hold a small print book or magazine at a distance while you try to read it. Have them gradually move the book closer to your face until you can read the print clearly.
It's important to keep in mind that these methods are not as accurate as a comprehensive eye exam performed by an eye doctor, and the results should be used only as a rough estimate. If you have any concerns about your vision or eye health, it is always best to schedule an eye exam with an eye doctor to ensure that you receive the most accurate and appropriate treatment for your needs.