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Intraocular lens power calculation for microphthalmos

M Inatomi1, K Ishii, R Koide

  • 1Department of Ophthalmology, School of Medicine, Showa University Hospital, Tokyo, Japan.

Journal of Cataract and Refractive Surgery
|November 22, 1997
PubMed
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Accurate intraocular lens (IOL) power calculation in microphthalmic eyes is challenging. Theoretical formulas, particularly SRK/T, showed better refractive predictability than empirical ones in this small eye cohort.

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Biomedical Engineering

Background:

  • Microphthalmos presents unique challenges for accurate intraocular lens (IOL) power calculation.
  • Standard IOL formulas may not perform optimally in eyes with extremely short axial lengths.

Purpose of the Study:

  • To assess the refractive outcomes and precision of various IOL power calculation formulas in microphthalmic eyes.
  • To identify the most accurate formula for IOL power estimation in this specific patient group.

Main Methods:

  • Evaluated six eyes with axial lengths under 19.0 mm.
  • Compared the accuracy of SRK, SRK II, S-SRK, SRK/T, Holladay, and Hoffer Q formulas.
  • Analyzed postoperative refraction against predicted refraction.

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Main Results:

  • A trend towards postoperative hypermetropia was observed across all formulas.
  • The SRK/T formula provided the best refractive prediction.
  • Shorter axial length correlated with a greater tendency for hyperopic estimation.

Conclusions:

  • Theoretical IOL power calculation formulas demonstrated superior accuracy compared to empirical formulas in microphthalmic eyes.
  • Higher IOL power (e.g., 30.0 D) may be necessary for some microphthalmic patients to avoid severe hypermetropia.