The Cataract National Dataset electronic multicentre audit of 55 567 operations: when should IOLMaster biometric measurements be rechecked?

Purpose Calculation of intraocular lens (IOL) power for implantation during cataract surgery depends on ocular biometric measurements. The aim of this study was to characterise the normal range of intra- and interindividual variation in axial length (AL) and corneal power ( K ) when IOLMaster measur...

Celý popis

Uložené v:

Podrobná bibliografia
Vydané v:	Eye (London) Ročník 24; číslo 5; s. 894 - 900
Hlavní autori:	Knox Cartwright, N E, Johnston, R L, Jaycock, P D, Tole, D M, Sparrow, J M
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	London Nature Publishing Group UK 01.05.2010 Nature Publishing Group
Predmet:	Aged Aged, 80 and over Astigmatism - etiology Axial Length, Eye Biological and medical sciences Biometry Cataract Extraction Clinical Audit clinical-study Cornea - anatomy & histology Female Humans Intraoperative Period Laboratory Medicine Lens diseases Lens Implantation, Intraocular Lenses, Intraocular Male Medical sciences Medicine Medicine & Public Health Middle Aged Miscellaneous Ophthalmology Pharmaceutical Sciences/Technology Refraction, Ocular Surgery Surgical Oncology United Kingdom biometry axial length cataract surgery keratometry Biometrics Measurement Cataract Operation Keratometry Eye disease Lens disease Treatment Surgery Ophthalmology Anterior segment disease
ISSN:	0950-222X, 1476-5454, 1476-5454
On-line prístup:	Získať plný text
Tagy:	Pridať tag Žiadne tagy, Buďte prvý, kto otaguje tento záznam!

Popis
Shrnutí:	Purpose Calculation of intraocular lens (IOL) power for implantation during cataract surgery depends on ocular biometric measurements. The aim of this study was to characterise the normal range of intra- and interindividual variation in axial length (AL) and corneal power ( K ) when IOLMaster measurements were possible and to derive recommendations as to which outlying measurements merit verification before acceptance. Methods The Medisoft electronic patient database contains prospectively collected data conforming to the United Kingdom (UK) Cataract National Dataset on 55 567 cataract operations. From this AL and K information on the 32 556 eyes (14 016 paired) of patients older than 25 years, without corneal pathology, history of intraocular surgery and who had all biometric measurements taken with the Zeiss IOLMaster (Carl Zeiss Meditec) were extracted. R 2.8.1 (R Foundation for Statistical Computing) was used for statistical analysis. Results Mean age was 76.4 years and 62.0% were female. Mean (95% confidence interval) values for AL, mean K and corneal astigmatism were 23.40 (21.27–26.59) mm, 43.90 (40.94–47.01) D and 1.04 (<2.50) D. Nearly all astigmatism was either with or against the rule. Differences between paired eyes were not statistically significant. 95% individuals had asymmetry of AL and mean K <0.70 mm and 0.92 D, respectively. Conclusions On the basis of approximation of the 95% CI above, it is suggested that AL, mean K and keratometric astigmatism measurements outside the ranges 21.30–26.60 mm, 41.00–47.00 D and >2.50 D, respectively, and intraindividual asymmetry of AL >0.70 mm or mean K >0.90 D should be verified before acceptance.
Bibliografia:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0950-222X 1476-5454 1476-5454
DOI:	10.1038/eye.2009.196