How to Choose the Right Lens Index for You
Article Summary
Compare lens thickness, weight, and price across different refractive indices to help you choose the best option.
Higher lens refractive index means thinner and lighter lenses for the same prescription. Common options include 1.56, 1.60, 1.67, and 1.74.
Select 1.56 for temperatures below 300°; 1.60 is recommended for 300-600°; choose 1.67 or 1.74 for temperatures above 600°. For high prescriptions, consider aspheric designs to reduce edge distortion.
FAQ
How long does an eye exam take?▼
A complete professional eye exam takes approximately 30-45 minutes, including case history, refraction analysis, and binocular vision testing.
Is computer refraction accurate?▼
Automated refraction provides objective screening data only. A final, accurate prescription requires comprehensive subjective examination and trial lens adjustments by a qualified optometrist.
Why is binocular vision examination necessary?▼
Binocular vision assessment evaluates how well your two eyes work together. Many people have good vision in each eye individually, but poor coordination between them can cause eye strain during reading.
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