Calculation of Unknown Preoperative K Readings in Postrefractive Surgery Patients
Purpose. To determine the unknown preoperative K readings (Kpre) to be used in history-based methods, for intraocular lens (IOL) power calculation in patients who have undergone myopic photorefractive keratectomy (PRK). Methods. A regression formula generated from the left eyes of 174 patients who h...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Journal of Ophthalmology |
| Online Access: | http://dx.doi.org/10.1155/2018/3120941 |
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| _version_ | 1832563008672366592 |
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| author | Nicola Rosa Maddalena De Bernardo Maria Borrelli |
| author_facet | Nicola Rosa Maddalena De Bernardo Maria Borrelli |
| author_sort | Nicola Rosa |
| collection | DOAJ |
| description | Purpose. To determine the unknown preoperative K readings (Kpre) to be used in history-based methods, for intraocular lens (IOL) power calculation in patients who have undergone myopic photorefractive keratectomy (PRK). Methods. A regression formula generated from the left eyes of 174 patients who had undergone PRK for myopia or for myopic astigmatism was compared with other methods in 168 right eyes. The Pearson index and paired t-test were utilized for statistical analysis. Results. The differences between Kpre and those obtained with the other methods were as follows: 0.61 ± 0.94 D (range: −3.94 to 2.05 D, p<0.01) subtracting the effective treatment, 0.01 ± 0.86 D (range: −2.61 to 2.34 D, p=0.82) with Rosa’s formula, −0.02 ± 1.31 D (range: −3.43 to 3.68 D, p=0.82) with the current study formula, and −0.43 ± 1.40 D (range: −3.98 to 3.12 D, p<0.01) utilizing a mean K (Km) of 43.5 D. Conclusions. These formulas may permit the utilization of history-based methods, that is, the double-K method in calculating the IOL power following PRK when Kpre are unknown. |
| format | Article |
| id | doaj-art-49bf0c4b497b43aca3e879238fb98116 |
| institution | Kabale University |
| issn | 2090-004X 2090-0058 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Ophthalmology |
| spelling | doaj-art-49bf0c4b497b43aca3e879238fb981162025-02-03T01:21:15ZengWileyJournal of Ophthalmology2090-004X2090-00582018-01-01201810.1155/2018/31209413120941Calculation of Unknown Preoperative K Readings in Postrefractive Surgery PatientsNicola Rosa0Maddalena De Bernardo1Maria Borrelli2Department of Medicine and Surgery, University of Salerno, Salerno, ItalyDepartment of Medicine and Surgery, University of Salerno, Salerno, ItalyDepartment of Ophthalmology, Heinrich Heine University Düsseldorf, Düsseldorf, GermanyPurpose. To determine the unknown preoperative K readings (Kpre) to be used in history-based methods, for intraocular lens (IOL) power calculation in patients who have undergone myopic photorefractive keratectomy (PRK). Methods. A regression formula generated from the left eyes of 174 patients who had undergone PRK for myopia or for myopic astigmatism was compared with other methods in 168 right eyes. The Pearson index and paired t-test were utilized for statistical analysis. Results. The differences between Kpre and those obtained with the other methods were as follows: 0.61 ± 0.94 D (range: −3.94 to 2.05 D, p<0.01) subtracting the effective treatment, 0.01 ± 0.86 D (range: −2.61 to 2.34 D, p=0.82) with Rosa’s formula, −0.02 ± 1.31 D (range: −3.43 to 3.68 D, p=0.82) with the current study formula, and −0.43 ± 1.40 D (range: −3.98 to 3.12 D, p<0.01) utilizing a mean K (Km) of 43.5 D. Conclusions. These formulas may permit the utilization of history-based methods, that is, the double-K method in calculating the IOL power following PRK when Kpre are unknown.http://dx.doi.org/10.1155/2018/3120941 |
| spellingShingle | Nicola Rosa Maddalena De Bernardo Maria Borrelli Calculation of Unknown Preoperative K Readings in Postrefractive Surgery Patients Journal of Ophthalmology |
| title | Calculation of Unknown Preoperative K Readings in Postrefractive Surgery Patients |
| title_full | Calculation of Unknown Preoperative K Readings in Postrefractive Surgery Patients |
| title_fullStr | Calculation of Unknown Preoperative K Readings in Postrefractive Surgery Patients |
| title_full_unstemmed | Calculation of Unknown Preoperative K Readings in Postrefractive Surgery Patients |
| title_short | Calculation of Unknown Preoperative K Readings in Postrefractive Surgery Patients |
| title_sort | calculation of unknown preoperative k readings in postrefractive surgery patients |
| url | http://dx.doi.org/10.1155/2018/3120941 |
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