Optometrist's Calculator

Optics Engine v2.5

Rx Transposition

Sphere Power Sph

DS

Cylinder Power Cyl

DC

Meridian Axis Axis

°

Transposed Matrix

New Sphere

Sph + Cyl

+0.00

New Cylinder

Sign Inverted

0.00

Target Axis

± 90° Shift

180°

Near Near-Only Rx Calculator

Near-Only Rx Calculator

Converts distance Rx + Add power into reading single-vision

Distance Sphere (Sph)

Near Addition (Add)

Cylinder (Cyl) - optional

Axis (°) - optional

Axis must be between 0 and 180

Near-Only (Reading) Prescription:

Addition Power Calculator

Optics Engine v3.0

Power Addition

Near Sphere Power Near Sph

DS

Distance Sphere Power Dist Sph

DS

Analysis Matrix

Sphere Addition

+2.00 D

Formula: Near Sphere − Distance Sphere Math Breakdown: (+2.50) − (+0.50) = +2.00 D

Optics Matrix Engine v5.0

Contact Lens Converter

*Calculations match standard 12mm vertex adjustments rounded to nearest 0.25 steps.

Rx

Right Eye (OD)

Left Eye (OS)

SPH

DS

DS

CYL

DC

DC

AXIS

°

°

AP

ADD

ADD

Calculated Lens Matrix

Right Eye (OD)

Sph-3.75

Cyl-1.25

Axis180°

Add+2.00

Lens Profile: Multifocal Toric Matrix

Left Eye (OS)

Sph-3.50

CylDS

Axis—

Add+2.00

Lens Profile: Spherical Equivalent + Add Profile

Dual Meridian Retinoscopy Converter

Working Distance Lens Offset 67 cm (+1.50 D Offset) 50 cm (+2.00 D Offset) 75 cm (+1.33 D Offset) 0 cm (Direct Net Powers)

Meridian 1 Gross Power (D)

Meridian 1 Axis (°)

Meridian 2 Gross Power (D)

Meridian 2 Axis (°)

Minus Cylinder Format (Standard)

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Plus Cylinder Format

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