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The primary lens power. Negative (-) means nearsightedness; positive (+) means farsightedness.

These indicate if you have astigmatism and the orientation needed to correct it. how to buy prescription glasses

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. The primary lens power

Additional magnifying power for reading, often used in bifocals or progressives. 3. Choose Between Online vs. In-Store how to buy prescription glasses

Right eye ( Oculus Dexter ) and Left eye ( Oculus Sinister ).