Lens Thickness Calculator

Calculate lens thickness for eyeglasses based on your prescription, lens material, and frame measurements.

Prescription & Frame Details

Prescription Information

Right Eye Sphere (D)

Left Eye Sphere (D)

Right Eye Cylinder (D)

Left Eye Cylinder (D)

Frame Measurements (mm)

Frame Width

Frame Height

Bridge Width

Pupillary Distance (PD)

Lens Material & Treatment

Lens Material

Lens Type

Thickness Results

Enter prescription details and click calculate to see results

Lens Thickness Tips

• Higher index materials create thinner lenses
• Smaller frames reduce edge thickness
• Aspheric lenses can reduce center thickness
• Consult your optometrist for final recommendations

Lens Materials & Refractive Index

Plastic (CR-39)

Most common and affordable

• Refractive Index: 1.49
• Thickness: Standard
• Impact Resistance: Good

Polycarbonate

Impact resistant and lightweight

• Refractive Index: 1.59
• Thickness: 20% thinner than plastic
• Impact Resistance: Excellent

High Index 1.74

Thinnest available option

• Refractive Index: 1.74
• Thickness: 50% thinner than plastic
• Impact Resistance: Good