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The primary lens power. Negative (-) means nearsightedness; positive (+) means farsightedness. Don't be intimidated by the numbers
The most critical step is a comprehensive eye exam with an optometrist or ophthalmologist to ensure your corrective measurements are current. Prescriptions typically expire every 1–2 years. how to buy prescription glasses
Additional magnifying power for reading, often used in bifocals or progressives. 3. Choose Between Online vs. In-Store