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New equivalent keratometry reading calculation with a rotating Scheimpflug camera for intraocular lens power calculation after myopic corneal surgery

Authors
 Kyoung Yul Seo  ;  Chan Young Im  ;  Hun Yang  ;  Taeim Kim  ;  Eung Kweon Kim  ;  Terry Kim  ;  Sang Min Nam 
Citation
 JOURNAL OF CATARACT AND REFRACTIVE SURGERY, Vol.40(11) : 1834-1842, 2014 
Journal Title
 JOURNAL OF CATARACT AND REFRACTIVE SURGERY 
ISSN
 0886-3350 
Issue Date
2014
MeSH
Adult ; Aged ; Biometry/methods ; Cornea/physiopathology* ; Corneal Surgery, Laser* ; Female ; Humans ; Lens Implantation, Intraocular ; Lenses, Intraocular* ; Male ; Middle Aged ; Myopia/physiopathology ; Myopia/surgery* ; Optics and Photonics* ; Phacoemulsification ; Photography/instrumentation* ; Young Adult
Abstract
PURPOSE: To calculate the keratometric (K) reading in corneas modified by myopic keratorefractive surgery using the total corneal refractive power (TCRP) of the Pentacam rotating Scheimpflug camera. SETTING: University hospitals and private clinics, South Korea DESIGN: Evaluation of diagnostic test or technology. METHODS: The study comprised healthy eyes, eyes having myopic keratorefractive surgery, and eyes having cataract surgery after myopic keratorefractive surgery. The conversion equation from the TCRP in the central 4.0 mm zone (TCRP4) to a K reading was derived in normal corneas. This equation was rechecked and its application range extended in corneas modified by myopic keratorefractive surgery. Then, the predictability of the TCRP method, combining the K reading derived from the TCRP4 and the Holladay 2 formula, was evaluated in a case series of cataract surgery patients who had previous myopic keratorefractive surgery. RESULTS: The K reading derived from the TCRP4 was obtained by adding 0.7 diopter (D). This conversion factor was applicable after myopic keratorefractive surgery because changes in TCRP4 were equal to changes in refraction in the 4.0 mm zone. The TCRP method predicted intraocular lens power within ± 0.5 D in 83% and within ± 1.0 D in 94% of eyes having cataract surgery after myopic keratorefractive surgery. CONCLUSION: The TCRP4 of the rotating Scheimpflug camera was successfully converted into the equivalent K reading, and the TCRP method showed good predictability in corneas modified by myopic keratorefractive surgery. FINANCIAL DISCLOSURE: No author has a financial or proprietary interest in any material or method mentioned.
Full Text
http://www.sciencedirect.com/science/article/pii/S0886335014007056
DOI
10.1016/j.jcrs.2013.11.044
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Ophthalmology (안과학교실) > 1. Journal Papers
Yonsei Authors
Kim, Eung Kweon(김응권) ORCID logo https://orcid.org/0000-0002-1453-8042
Kim, Tae Im(김태임) ORCID logo https://orcid.org/0000-0001-6414-3842
Seo, Kyoung Yul(서경률) ORCID logo https://orcid.org/0000-0002-9855-1980
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/138811
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