Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical case
The main source of intraocular lens (IOL) power calculation errors in phacoemulsification (PE) is axial length (AL) measurement inaccuracy in cases if optical biometry cannot be used.bto describe an original double-step method of IOL power calculation in lens opacities which exclude AL measurement w...
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Real Time Ltd
2023-12-01
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| Series: | Российский офтальмологический журнал |
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| Online Access: | https://roj.igb.ru/jour/article/view/1366 |
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| author | A. N. Kulikov E. V. Danilenko N. V. Nevin E. Yu. Kozhevnikov |
| author_facet | A. N. Kulikov E. V. Danilenko N. V. Nevin E. Yu. Kozhevnikov |
| author_sort | A. N. Kulikov |
| collection | DOAJ |
| description | The main source of intraocular lens (IOL) power calculation errors in phacoemulsification (PE) is axial length (AL) measurement inaccuracy in cases if optical biometry cannot be used.bto describe an original double-step method of IOL power calculation in lens opacities which exclude AL measurement with optical biometry.Material and methods. Patient S. (male, 71) with a bilateral immature cataract underwent right eye phacoemulsification (PE) with no IOL implantation. After that, AL was measured in the aphakic state with transparent optical media and used in combination with preoperative anterior segment biometry data to calculate the IOL power. In the second stage, a selected lens with an extended focus range was implanted.Results. The patient was examined and discharged on the second day after surgery with visual acuity OD 0.3 sph +0.25 cyl -0.75 ax150 = 0.5 and signs of moderate postoperative keratopathy. After 2 weeks, uncorrected visual acuity was as high as 0.9 and could not be further corrected by spectacle lenses. The patient was admitted for surgical treatment of the left eye cataract and also operated in two stages. The AL measured by the optical method in the aphakic state, was 0.31 mm less than that measured before the operation. Six months after PE with IOL implantation, distance visual acuity in both eyes was 1.2, the patient could use binocular vision for reading and PC work with no difficulty.Conclusion. The double-step approach to IOL power calculation is justified in cases of strong decrease of crystalline lens transparency, especially in complicated cases, for example, in high myopia or “premium” lens implantation, in which patients are especially sensitive to correct target refraction, even though this approach requires a delayed IOL implantation, which should take place after a precise calculation of AL taken in the aphakic state. |
| format | Article |
| id | doaj-art-60ec50ad00024c73afbbbe3168e76e21 |
| institution | DOAJ |
| issn | 2072-0076 2587-5760 |
| language | Russian |
| publishDate | 2023-12-01 |
| publisher | Real Time Ltd |
| record_format | Article |
| series | Российский офтальмологический журнал |
| spelling | doaj-art-60ec50ad00024c73afbbbe3168e76e212025-08-20T02:54:11ZrusReal Time LtdРоссийский офтальмологический журнал2072-00762587-57602023-12-0116412713210.21516/2072-0076-2023-16-4-127-132650Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical caseA. N. Kulikov0E. V. Danilenko1N. V. Nevin2E. Yu. Kozhevnikov3S.M. Kirov Military Medical AcademyS.M. Kirov Military Medical AcademyS.M. Kirov Military Medical AcademyS.M. Kirov Military Medical AcademyThe main source of intraocular lens (IOL) power calculation errors in phacoemulsification (PE) is axial length (AL) measurement inaccuracy in cases if optical biometry cannot be used.bto describe an original double-step method of IOL power calculation in lens opacities which exclude AL measurement with optical biometry.Material and methods. Patient S. (male, 71) with a bilateral immature cataract underwent right eye phacoemulsification (PE) with no IOL implantation. After that, AL was measured in the aphakic state with transparent optical media and used in combination with preoperative anterior segment biometry data to calculate the IOL power. In the second stage, a selected lens with an extended focus range was implanted.Results. The patient was examined and discharged on the second day after surgery with visual acuity OD 0.3 sph +0.25 cyl -0.75 ax150 = 0.5 and signs of moderate postoperative keratopathy. After 2 weeks, uncorrected visual acuity was as high as 0.9 and could not be further corrected by spectacle lenses. The patient was admitted for surgical treatment of the left eye cataract and also operated in two stages. The AL measured by the optical method in the aphakic state, was 0.31 mm less than that measured before the operation. Six months after PE with IOL implantation, distance visual acuity in both eyes was 1.2, the patient could use binocular vision for reading and PC work with no difficulty.Conclusion. The double-step approach to IOL power calculation is justified in cases of strong decrease of crystalline lens transparency, especially in complicated cases, for example, in high myopia or “premium” lens implantation, in which patients are especially sensitive to correct target refraction, even though this approach requires a delayed IOL implantation, which should take place after a precise calculation of AL taken in the aphakic state.https://roj.igb.ru/jour/article/view/1366intraocular lens power calculationoptical biometrycalculation error |
| spellingShingle | A. N. Kulikov E. V. Danilenko N. V. Nevin E. Yu. Kozhevnikov Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical case Российский офтальмологический журнал intraocular lens power calculation optical biometry calculation error |
| title | Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical case |
| title_full | Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical case |
| title_fullStr | Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical case |
| title_full_unstemmed | Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical case |
| title_short | Double-step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry. A clinical case |
| title_sort | double step calculation of the intraocular lens power in lens opacities excluding the measurement of axial eye length by optical biometry a clinical case |
| topic | intraocular lens power calculation optical biometry calculation error |
| url | https://roj.igb.ru/jour/article/view/1366 |
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