Clinical observation of intraocular lens calculation in eyes with previous radial keratotomy
AIM: To evaluate the accuracy of the Barrett True K intraocular lens(IOL)calculation formulas in eyes with previous radial keratotomy(RK).<p>METHODS: From February 2017 to February 2019, 42 eyes of 22 cataract patients with previous RK were selected in our hospital. Two methods were used to ca...
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| Format: | Article |
| Language: | English |
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Press of International Journal of Ophthalmology (IJO PRESS)
2019-11-01
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| Series: | Guoji Yanke Zazhi |
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| Online Access: | http://ies.ijo.cn/cn_publish/2019/11/201911035.pdf |
| _version_ | 1811281090181070848 |
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| author | Ke-Ke Zhu Hong-Mei Mu |
| author_facet | Ke-Ke Zhu Hong-Mei Mu |
| author_sort | Ke-Ke Zhu |
| collection | DOAJ |
| description | AIM: To evaluate the accuracy of the Barrett True K intraocular lens(IOL)calculation formulas in eyes with previous radial keratotomy(RK).<p>METHODS: From February 2017 to February 2019, 42 eyes of 22 cataract patients with previous RK were selected in our hospital. Two methods were used to calculate IOL refraction before surgery: 1)Selected the smallest anterior surface K value in the area of 3mm central corneal diameter, used SRK/T formula, the target refraction was set at -1.0D; 2)Used Barrett True K on-line calculation formula, the mode of RK was selected and the target refraction was set at -1.0D. Three months after operation, the refractive state of the eyes was examined and the refractive errors calculated by the two methods were compared.<p>RESULTS: The average refractive error of Barrett formula method was 0.61(-0.37, 0.88)3mo after operation, which was significantly lower than that of traditional formula method 0.35(-0.25, 0.63)D(<i>P</i><0.05). There was no significant difference in absolute refractive error between the two methods(<i>P</i>>0.05). The refractive errors of traditional formula method in the range of ±0.5D, ±1.0D, ±2.0D accounted for 21%, 45%, 90% respectively. The refractive errors of Barrett formula method in the range of ±0.5D, ±1.0D, ±2.0D accounted for 31%, 74%, 100% respectively(<i>P</i><0.05).<p>CONCLUSION: Barrett True K online formula applied to cataract patients after RK can achieve satisfactory refractive status. |
| first_indexed | 2024-04-13T01:26:08Z |
| format | Article |
| id | doaj.art-1cee7c7164de4d509846d6b80953d0be |
| institution | Directory Open Access Journal |
| issn | 1672-5123 1672-5123 |
| language | English |
| last_indexed | 2024-04-13T01:26:08Z |
| publishDate | 2019-11-01 |
| publisher | Press of International Journal of Ophthalmology (IJO PRESS) |
| record_format | Article |
| series | Guoji Yanke Zazhi |
| spelling | doaj.art-1cee7c7164de4d509846d6b80953d0be2022-12-22T03:08:37ZengPress of International Journal of Ophthalmology (IJO PRESS)Guoji Yanke Zazhi1672-51231672-51232019-11-0119111967196910.3980/j.issn.1672-5123.2019.11.35Clinical observation of intraocular lens calculation in eyes with previous radial keratotomyKe-Ke Zhu0Hong-Mei Mu1Department of Ophthalmology, Kaifeng Central Hospital, Kaifeng 475000, Henan Province, ChinaDepartment of Ophthalmology, Kaifeng Central Hospital, Kaifeng 475000, Henan Province, ChinaAIM: To evaluate the accuracy of the Barrett True K intraocular lens(IOL)calculation formulas in eyes with previous radial keratotomy(RK).<p>METHODS: From February 2017 to February 2019, 42 eyes of 22 cataract patients with previous RK were selected in our hospital. Two methods were used to calculate IOL refraction before surgery: 1)Selected the smallest anterior surface K value in the area of 3mm central corneal diameter, used SRK/T formula, the target refraction was set at -1.0D; 2)Used Barrett True K on-line calculation formula, the mode of RK was selected and the target refraction was set at -1.0D. Three months after operation, the refractive state of the eyes was examined and the refractive errors calculated by the two methods were compared.<p>RESULTS: The average refractive error of Barrett formula method was 0.61(-0.37, 0.88)3mo after operation, which was significantly lower than that of traditional formula method 0.35(-0.25, 0.63)D(<i>P</i><0.05). There was no significant difference in absolute refractive error between the two methods(<i>P</i>>0.05). The refractive errors of traditional formula method in the range of ±0.5D, ±1.0D, ±2.0D accounted for 21%, 45%, 90% respectively. The refractive errors of Barrett formula method in the range of ±0.5D, ±1.0D, ±2.0D accounted for 31%, 74%, 100% respectively(<i>P</i><0.05).<p>CONCLUSION: Barrett True K online formula applied to cataract patients after RK can achieve satisfactory refractive status.http://ies.ijo.cn/cn_publish/2019/11/201911035.pdfradial keratotomycataractrefractive errorsBarrett True K formula |
| spellingShingle | Ke-Ke Zhu Hong-Mei Mu Clinical observation of intraocular lens calculation in eyes with previous radial keratotomy Guoji Yanke Zazhi radial keratotomy cataract refractive errors Barrett True K formula |
| title | Clinical observation of intraocular lens calculation in eyes with previous radial keratotomy |
| title_full | Clinical observation of intraocular lens calculation in eyes with previous radial keratotomy |
| title_fullStr | Clinical observation of intraocular lens calculation in eyes with previous radial keratotomy |
| title_full_unstemmed | Clinical observation of intraocular lens calculation in eyes with previous radial keratotomy |
| title_short | Clinical observation of intraocular lens calculation in eyes with previous radial keratotomy |
| title_sort | clinical observation of intraocular lens calculation in eyes with previous radial keratotomy |
| topic | radial keratotomy cataract refractive errors Barrett True K formula |
| url | http://ies.ijo.cn/cn_publish/2019/11/201911035.pdf |
| work_keys_str_mv | AT kekezhu clinicalobservationofintraocularlenscalculationineyeswithpreviousradialkeratotomy AT hongmeimu clinicalobservationofintraocularlenscalculationineyeswithpreviousradialkeratotomy |