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Br J Ophthalmol. 1986 February; 70(2): 152–154.
PMCID: PMC1040942

On the calculation of power from curvature of the cornea.


The theoretical basis for the calculation of corneal refractive power from anterior curvature is considered. It is shown that the power can be calculated with sufficient accuracy from one simple formula provided the refractive index of the 'cornea' is 1.3315. It is suggested that keratometer readings should be calibrated with this value in order to increase the accuracy in intraocular lens calculation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Percival P. Lens power calculation--is it necessary? Trans Ophthalmol Soc U K. 1983;103(Pt 5):577–579. [PubMed]
  • Hillman JS. Intraocular lens power calculation for planned ametropia: a clinical study. Br J Ophthalmol. 1983 Apr;67(4):255–258. [PMC free article] [PubMed]
  • Hoffer KJ. Preoperative evaluation of the cataractous patient. Surv Ophthalmol. 1984 Jul-Aug;29(1):55–69. [PubMed]
  • Binkhorst RD. Intraocular lens power calculation. Int Ophthalmol Clin. 1979 Winter;19(4):237–252. [PubMed]

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