Eyeglass Prescription Calculator
Eyeglass Prescription
Estimate lens thickness based on prescription strength and lens type.
Formula
Thickness = Base + (|Sphere| x Radius) / (2 x (Index - 1) x 10)
Frequently Asked Questions
What lens index should I choose?
Prescriptions over -4 or +4 benefit from 1.67 or 1.74 high index lenses.
Are thinner lenses worth the extra cost?
For strong prescriptions, high index lenses are lighter and more comfortable.
Does frame size affect lens thickness?
Yes, larger frames require thicker lenses, especially for strong prescriptions.
You may also need
H
Contact Lens Cost Calculator
Free contact lens cost calculator. Get personalized health insights based on your profile.
HealthH
Pupillary Distance Calculator
Estimate pupillary distance from frame measurements and fit.
HealthH
Reading Glasses Strength Calculator
Estimate reading lens power based on age and reading distance.
Health