Lens Thickness Estimator

Full geometric model — dual eye, frame-specific thickness distribution

Important: This calculator provides theoretical thickness estimates only. Final lens thickness is determined by laboratory surfacing design, safety standards, and manufacturing constraints.

Lens Material

Abbe Value

Base CT

1.6mm

Low Abbe value — chromatic aberration may be noticeable, especially in high powers

Frame Measurements

A Size (mm)

B Size (mm)

ED (mm)

Frame PD (mm)

Frame Type

Min edge for Full Rim: 1mm

OD (Right Eye)

Spectacle Rx

Sphere

Cylinder

Axis °

Patient PD

Monocular PD (mm)

Dec: Out 0.0mm

OS (Left Eye)

Spectacle Rx

Sphere

Cylinder

Axis °

Patient PD

Monocular PD (mm)

Dec: Out 0.0mm

Thickness Distribution

OD (Right Eye)

Good

Thickness Map — OD Right Eye

2.9mm

3.6mm

1.6mm

ThinModerateThickVery Thick

Thickest

Nasal

Thinnest

Center

1.6mm

Nasal

3.6mm

Temporal

3.6mm

Superior

2.9mm

Inferior

2.9mm

Max Edge

3.6mm

SE: -4.63D | Dominant power: -5.25D

Decentration: Out 0.0mm → thickens nasal edge

Required blank: 60mm

Thickness driven by: High power

Frame type: Full Rim (min edge 1mm)

Minus lens — thinnest at center, thickest at edges. Visible ring effect increases with power.

OS (Left Eye)

Good

Thickness Map — OS Left Eye

2.7mm

3.5mm

1.6mm

ThinModerateThickVery Thick

Thickest

Nasal

Thinnest

Center

1.6mm

Nasal

3.5mm

Temporal

3.5mm

Superior

2.7mm

Inferior

2.7mm

Max Edge

3.5mm

SE: -4.13D | Dominant power: -4.50D

Decentration: Out 0.0mm → thickens temporal edge

Required blank: 60mm

Thickness driven by: High power

Frame type: Full Rim (min edge 1mm)

Minus lens — thinnest at center, thickest at edges. Visible ring effect increases with power.

Material Comparison (OD dominant power -5.25D)

Material	n	Abbe	OD Max Edge	OS Max Edge	Rating
CR-39 (n=1.498)	1.498	58	4.7mm	4.6mm	Good
Standard Plastic (n=1.53)	1.53	45	4.6mm	4.4mm	Good
Polycarbonate (n=1.586)	1.586	30	3.8mm	3.7mm	Good
Mid-Index (n=1.60)	1.6	42	4.1mm	3.9mm	Good
High-Index (n=1.67) ✓	1.67	32	3.6mm	3.5mm	Good
Ultra High-Index (n=1.74)	1.74	33	3.3mm	3.2mm	Good

Clinical Disclaimer: Thickness values are theoretical estimates based on sag geometry. Actual lab results will vary based on surfacing design, base curve selection, aspheric optimization, and manufacturing tolerances. Always verify with lab order confirmation.