How to Find Your Eye Power
Your eye power, also known as your refractive error, is determined by a comprehensive eye exam performed by an optometrist or ophthalmologist. It's not something you can reliably determine at home using online tests or charts. While online tests might give you a rough estimate, they cannot replace a professional examination.
The numbers in your eyeglass prescription indicate your eye power. Specifically, the numbers found under abbreviations like OD (right eye), OS (left eye), and SPH (sphere) represent your eye power. This number typically ranges from (+/-) 0 to 20, with positive numbers indicating hyperopia (farsightedness) and negative numbers indicating myopia (nearsightedness).
- SPH (Sphere): This indicates the overall power of the lens needed to correct your refractive error.
- OD (Oculus Dexter): Refers to your right eye.
- OS (Oculus Sinister): Refers to your left eye.
Other abbreviations may also be present, such as CYL (cylinder) for astigmatism correction.
How to Find a Qualified Eye Care Professional
To accurately determine your eye power, you need a professional eye exam. Here's how to find a qualified eye care professional:
- Search online: Use online search engines like Google to find optometrists or ophthalmologists in your area. Reputable online directories can also be helpful. (https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/finding-eye-doctor)
- Check insurance: Contact your insurance provider to find in-network eye care professionals.
- Ask for recommendations: Ask family, friends, or your primary care physician for recommendations.
The Importance of a Professional Eye Exam
Online vision tests are convenient but unreliable for determining your precise eye power. A professional eye exam is crucial for accurate diagnosis and appropriate treatment. It allows for a thorough assessment of your overall eye health, not just your refractive error.
