| Changes in Ocular Biometrics Measured after Implantation of a Phakic Intraocular Lens. |
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Jung Hoo Lee, Gyu Won Ryu, Byung Gun Park |
1Department of Ophthalmology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea. Kkul83@hanmail.net
2Nunevit Eye Center, Busan, Korea. |
| 유수정체용 안내렌즈삽입술 후 측정된 생체계측값의 변화 |
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이정후1⋅류규원2⋅박병건1 |
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인제대학교 의과대학 부산백병원 안과학교실1, 누네빛안과의원2 |
Correspondence:
Byung Gun Park,
Email: Kkul83@hanmail.net
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Received: 21 September 2017 • Revised: 26 December 2017 • Accepted: 19 February 2018 |
| Abstract |
PURPOSE
To measure changes in ocular biometrics required for calculating intraocular lens powers during cataract surgery on phakic eyes undergoing implantation of a collamer lens (AQUA ICL [STAAR Surgical Company, Monrovia, CA, USA] or an Artiflex® lens [Ophtec BV, Groningen, Netherlands]) to correct myopia. METHODS: A total of 45 eyes of 23 patients who underwent implantation of iris-fixated or posterior chamber phakic intraocular lenses (pIOLs) for correction of myopia >−7D were evaluated using the euphakic mode of the IOL Master® 500 (Carl Zeiss Meditec AG, Jena, Germany) prior to pIOL implantation. After implantation, the axial length (AL) and anterior chamber depth (ACD) were measured 1 month postoperatively using both the euphakic and pseudophakic modes of the instrument. We compared differences between predicted IOL powers calculated using the Sanders-Retzlaff-Kraff/Theoretical (SRK/T) and Haigis formulae. RESULTS: Seventeen eyes (37.8%) receiving ICL and 28 (62.2%) Artiflex® pIOL implants were included in the study. After pIOL implantation, ALs measured by the euphakic and pseudophakic modes of the IOL Master were significantly longer (p = 0.03, p < 0.0001) and ACDs significantly shorter (p < 0.0001, p <0.0001, respectively) than preoperatively. The changes after surgery were less when the euphakic rather than the pseudophakic measurement mode was employed. The postoperative IOL powers predicted by the SRK/T (−0.03D, p = 0.023) and Haigis formulae (−0.06D, p = 0.001) were significantly lower that the preoperative values. However, the differences were small and did not influence IOL power selection. CONCLUSIONS: After pIOL implantation, AL changes were less when measured using the euphakic rather than the pseudophakic mode of the IOL Master. Although the ACDs differed significantly after pIOL implantation, the changes were too small to influence IOL power calculations. ACD measurements differed significantly from those of AL after IOL implantation. Thus, a pIOL implantation history may affect biometric findings during cataract surgery. |
| Key Words:
Anterior chamber depth;Axial length;Phakic intraocular lens |
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