Abstract
ObjectiveDescribe the ocular biometric parameters and their associations in a population of cataract surgery candidates.MethodsA cross-sectional study of 13,012 eyes of 6,506 patients was performed. Biometric parameters of the eyes were measured by optical low-coherence reflectometry. The axial length (AL), mean keratometry (K) and astigmatism, anterior chamber depth (ACD) (epithelium to lens), lens thickness (LT), and Corneal Diameter (CD) were evaluated.ResultsThe mean age was 69 ± 10 years (44–99 years). Mean AL, Km, and ACD were 23.87 ± 1.55 mm (19.8–31.92 mm), 43.91 ± 1.71 D (40.61–51.14 D), and 3.25 ± 0.44 mm (2.04–5.28 mm), respectively. The mean LT was 4.32 ± 0.49 mm (2.73–5.77 mm) and the mean CD was 12.02 ± 0.46 mm (10.50–14.15 mm). The mean corneal astigmatism was 1.08 ± 0.84 D (0.00–7.58 D) and 43.5% of eyes had astigmatism ≥ 1.00 D. Male patients had longer AL and ACDs (p < .001) and flatter corneas (p < .001). In regression models considering age, gender, Km, ACD, LT, and CD, a longer AL was associated with being male and having higher ACD, LT and CD.ConclusionsThese data represent normative biometric values for the Portuguese population. The greatest predictor of ocular biometrics was gender. There was no significant correlation between age and AL, ACD, or Km. These results may be relevant in the evaluation of refractive error and in the calculation of intraocular lens power.
Highlights
With the increase in life expectancy of populations, there has been a progressive increase in the volume of cataract surgery performed worldwide, and it is the most common elective surgery in many countries
There was no significant correlation between age and axial length (AL), anterior chamber depth (ACD), or Km
These results may be relevant in the evaluation of refractive error and in the calculation of intraocular lens power
Summary
With the increase in life expectancy of populations, there has been a progressive increase in the volume of cataract surgery performed worldwide, and it is the most common elective surgery in many countries. It is known that ocular biometric parameters such as axial length (AL), corneal power (K), and anterior chamber depth (ACD) (corneal epithelium to anterior lens) vary with gender, age, and ethnicity, and are different among different populations. [1, 2] In addition, many of the published studies were conducted using contact applanation ultrasound biometry, a method limited by several measurement errors limiting its use prior to cataract surgery, when premium lenses are implanted. [7, 8] Published studies of ocular biometric parameters using optical biometry are scarce, and this technology is constantly evolving and allows the evaluation of new parameters, such as measurement of the crystalline lens thickness (LT). Among various optical biometry devices available, Lenstar (Haag-Streit AG, Koeniz, Switzerland) has proved to be highly accurate in biometry measurements. [9]
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