Predictability of Intraocular Lens Power Calculation Formulae in Infantile Eyes With Unilateral Congenital Cataract: Results From the Infant Aphakia Treatment Study




The recent article describing the results from the infant aphakia treatment study contains a rare set of short eyes. It would be helpful to the ophthalmic community to have a starting point from which to choose lens constants for these formulas in short, infantile eyes.


It was encouraging to see how well the SRK/T (Sanders, Retzlaff and Kraff/Theoretical) formula did, given that it has a known flaw. This error is most evident in eyes with steep corneas, which many short eyes have. This error was corrected in the T2 formula.


It would be helpful to also evaluate these eyes with the T2 formula to know whether correcting this flaw improved the results further. It would also be helpful to know the results of other new formulas such as the Olsen, Universal, and Haigis formulas.


References



  1. 1. VanderVeen D.K., Trivedi R.H., Nizam A., Lynn M.J., and Lambert S.R.: Predictability of intraocular lens power calculation formulae in infantile eyes with unilateral congenital cataract: Results from the Infant Aphakia Treatment Study. Am J Ophthalmol 2013; 156: pp. 1252-1260

  2. 2. Haigis W.: Occurrence of erroneous anterior chamber depth in the SRK/T formula [letter]. J Cataract Refract Surg 1993; 19: pp. 442-446

  3. 3. Sheard R.M., Smith G.T., and Cooke D.L.: Improving the prediction accuracy of the SRK/T formula: The T2 formula. J Cataract Refract Surg 2010; 36: pp. 1829-1834

  4. 4. Olsen T. System and method for determining and predicting IOL power in situ. Available at http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=5&f=G&l=50&co1=AND&d=PG01&s1=%22olsen,+thomas%22.IN.&OS=IN/%22olsen,+thomas%22&RS=IN/%22olsen,+thomas%22. Accessed January 21, 2014.

  5. 5. Barrett G.D.: An improved universal theoretical formula for intraocular lens power prediction. J Cataract Refract Surg 1993; 19: pp. 713-720

  6. 6. Haigis W., Lege B., Miller N., and Schneider B.: Comparison of immersion ultrasound biometry and partial coherence interferometry for intraocular lens calculation according to Haigis. Graefes Arch Clin Exp Ophthalmol 2000; 238: pp. 765-773

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Jan 8, 2017 | Posted by in OPHTHALMOLOGY | Comments Off on Predictability of Intraocular Lens Power Calculation Formulae in Infantile Eyes With Unilateral Congenital Cataract: Results From the Infant Aphakia Treatment Study

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