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Intraocular Lens Power Calculations: A Practical Evaluation in Normal Subjects at The Wilmer Institute

Intraocular Lens Power Calculations: A Practical Evaluation in Normal Subjects at The Wilmer... Abstract • The practical value of preoperative intraocular lens power calculations in "normal" eyes with less than 4.50 diopters (D) of myopia or hyperopia was evaluated in a consecutive series of 520 eyes that underwent cataract extraction and lens implantation by four experienced surgeons at The Wilmer Ophthalmological Institute. The observed postoperative results with the lenses selected by the surgeons were compared with results calculated for the measurement-predicted emmetropic power lens and for a standard 20-D lens. The need for postoperative spectacle correction of residual refractive errors was comparable for all three choices of lens. Only two eyes (0.4%) would have developed greater than 4.00 D of refractive error with either the "implanted" or "predicted-emmetropic" lenses, as would 11 eyes (2.1%) with the "standard" 20-D lens. The surgeons' deviation from the calculated emmetropic lens did not reduce postoperative refractive error. References 1. Hillman J: The selection of intraocular lens power calculation by reference to the refraction: A clinical study . Trans Ophthalmol Soc UK 1982;102:495-497. 2. Thompson SM, Mohan-Roberts VA: A comparison of postoperative refractive results with and without intraocular lens power calculation . Br J Ophthalmol 1986;70:22-25.Crossref 3. Hillman J: Intraocular lens power calculation for ametropia: A clinical study . Br J Ophthalmol 1983;67:255-258.Crossref 4. Binkhorst RD: Pitfalls in the determination of intraocular lens power without ultrasound . Ophthalmic Surg 1976;7:69-82. 5. Percival P: Lens power calculation: Is it necessary? Trans Ophthalmol Soc UK 1983;103:577-579. 6. Kraff MC, Sanders DR, Lieberman HL: Determination of intraocular lens power: A comparison with and without ultrasound . Ophthalmic Surg 1978;9:81-84. 7. Sanders DR, Kraff MC: Improvement of intraocular lens power calculation using empirical data . Am Intra-Ocular Implant Soc J 1980;6:263-267.Crossref 8. Richards SC, Olson RJ, Richards, et al: Clinical evaluation of six intraocular lens calculation formulas . Am Intra-Ocular Implant Soc J 1985;11:153-158.Crossref 9. Sanders D, Retzlaff J, Kraff M, et al: Comparison of the accuracy of the Binkhorst, Colenbrander, and SRK implant power prediction formulas . Am Intra-Ocular Implant Soc J 1981;7:337-340.Crossref 10. Holladay JT, Prager TC, Ruiz RS, et al: Improving the predictability of intraocular lens power calculations . Arch Ophthalmol 1986;104:539-541.Crossref 11. Donzis P, Kastl PR, Gordon RA: An intraocular lens formula for short, normal, and long eyes . CLAO J 1985;11:95-98. 12. Shammas HJF: Axial length measurement and its relation to intraocular lens power calculations . Am Intra-Ocular Soc J 1982;8:346-349.Crossref 13. Thompson JT, Maumenee AE, Baker CC: A new posterior chamber intraocular lens formula for axial myopes . Ophthalmology 1984;91:484-488.Crossref 14. Hillman J: Intraocular lens power calculation for emmetropia: A clinical study . Br J Ophthalmol 1982;66:53-56.Crossref 15. Hoffer KJ: Accuracy of intraocular lens calculations . Arch Ophthalmol 1981;99:1819-1823.Crossref 16. Loyd TL, Gills JP: Linear regression software for intraocular lens implant power calculation . Am J Ophthalmol 1986;102:405. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

Intraocular Lens Power Calculations: A Practical Evaluation in Normal Subjects at The Wilmer Institute

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References (18)

Publisher
American Medical Association
Copyright
Copyright © 1987 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1987.01060080048026
Publisher site
See Article on Publisher Site

Abstract

Abstract • The practical value of preoperative intraocular lens power calculations in "normal" eyes with less than 4.50 diopters (D) of myopia or hyperopia was evaluated in a consecutive series of 520 eyes that underwent cataract extraction and lens implantation by four experienced surgeons at The Wilmer Ophthalmological Institute. The observed postoperative results with the lenses selected by the surgeons were compared with results calculated for the measurement-predicted emmetropic power lens and for a standard 20-D lens. The need for postoperative spectacle correction of residual refractive errors was comparable for all three choices of lens. Only two eyes (0.4%) would have developed greater than 4.00 D of refractive error with either the "implanted" or "predicted-emmetropic" lenses, as would 11 eyes (2.1%) with the "standard" 20-D lens. The surgeons' deviation from the calculated emmetropic lens did not reduce postoperative refractive error. References 1. Hillman J: The selection of intraocular lens power calculation by reference to the refraction: A clinical study . Trans Ophthalmol Soc UK 1982;102:495-497. 2. Thompson SM, Mohan-Roberts VA: A comparison of postoperative refractive results with and without intraocular lens power calculation . Br J Ophthalmol 1986;70:22-25.Crossref 3. Hillman J: Intraocular lens power calculation for ametropia: A clinical study . Br J Ophthalmol 1983;67:255-258.Crossref 4. Binkhorst RD: Pitfalls in the determination of intraocular lens power without ultrasound . Ophthalmic Surg 1976;7:69-82. 5. Percival P: Lens power calculation: Is it necessary? Trans Ophthalmol Soc UK 1983;103:577-579. 6. Kraff MC, Sanders DR, Lieberman HL: Determination of intraocular lens power: A comparison with and without ultrasound . Ophthalmic Surg 1978;9:81-84. 7. Sanders DR, Kraff MC: Improvement of intraocular lens power calculation using empirical data . Am Intra-Ocular Implant Soc J 1980;6:263-267.Crossref 8. Richards SC, Olson RJ, Richards, et al: Clinical evaluation of six intraocular lens calculation formulas . Am Intra-Ocular Implant Soc J 1985;11:153-158.Crossref 9. Sanders D, Retzlaff J, Kraff M, et al: Comparison of the accuracy of the Binkhorst, Colenbrander, and SRK implant power prediction formulas . Am Intra-Ocular Implant Soc J 1981;7:337-340.Crossref 10. Holladay JT, Prager TC, Ruiz RS, et al: Improving the predictability of intraocular lens power calculations . Arch Ophthalmol 1986;104:539-541.Crossref 11. Donzis P, Kastl PR, Gordon RA: An intraocular lens formula for short, normal, and long eyes . CLAO J 1985;11:95-98. 12. Shammas HJF: Axial length measurement and its relation to intraocular lens power calculations . Am Intra-Ocular Soc J 1982;8:346-349.Crossref 13. Thompson JT, Maumenee AE, Baker CC: A new posterior chamber intraocular lens formula for axial myopes . Ophthalmology 1984;91:484-488.Crossref 14. Hillman J: Intraocular lens power calculation for emmetropia: A clinical study . Br J Ophthalmol 1982;66:53-56.Crossref 15. Hoffer KJ: Accuracy of intraocular lens calculations . Arch Ophthalmol 1981;99:1819-1823.Crossref 16. Loyd TL, Gills JP: Linear regression software for intraocular lens implant power calculation . Am J Ophthalmol 1986;102:405.

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Aug 1, 1987

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