K-reading to Diopter Calculator

Single K-reading

Dual Meridians

Corneal Parameters

K-reading (D)

Please enter valid K-reading

Refractive Index

Corneal Power: –

Equivalent Diopter: –

Calculation Method: –

Calculation Details

K-reading: –

Refractive Index: –

Radius of Curvature: –

Formula Used: –

Corneal Power Distribution

Flat Meridian

Steep Meridian

40D 50D

Clinical Interpretation

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💡 About K-reading to Diopter Conversion

Keratometry readings measure corneal curvature and are converted to diopters using the lensmaker’s formula. This is essential for IOL power calculations, contact lens fitting, and refractive surgery planning.

Formula: D = (n – 1) / R × 1000

Where: D = Diopter power, n = Refractive index, R = Radius of curvature (mm)

Standard Values: n = 1.3375 (keratometric index), R = 337.5 / K-reading

Note: This calculator provides estimates for educational purposes. Clinical decisions should be based on comprehensive ophthalmic examination.