Biometry data and prevalence of corneal astigmatism in caucasian spanish candidates for cataract surgery

Summary Purpose To describe ocular biometric parameters and the prevalence of corneal astigmatism as well as age and gender correlations in a population of cataract surgery candidates and to estimate the number of eyes that would be candidates for a toric intraocular lens (IOL). Methods In consecutive patients requiring cataract surgery over a one-year period (June 2016 to June 2017), the following optical biometry measurements were performed on an IOLMaster 700 or Lenstar 900: axial length (AL), anterior chamber depth (ACD), lens thickness (LT), mean keratometry (K), flat keratometry (K1), steep keratometry (K2), corneal astigmatism (Cyl) and white-to-white diameter (WTW). Descriptive statistics for the demographic and biometric data were analyzed. Results The study sample included 6111 eyes of 3332 patients (59.3% women), with a mean age of 74.78 ± 9.7 years. The means of the compiled data are as follows: AL 23.58 ± 1.55 mm, ACD 3.08 ± 0.41 mm, LT 4.55 ± 0.52 mm, K 44.15 ± 1.54 diopters (D), K1 43.64 ± 1.57 D, K2 44.69 ± 1.61 D, Cyl 1.0 ± 0.81. D and WTW 11.88 ± 0.46 mm. The male patients had significantly larger eyes (higher AL, ACD and WTW) and flatter corneas (lower flat and steep K). Older patients had significantly lower AL, ACD and WTW, while their LT values were higher. Corneas became significantly steeper with age. 60.5% of eyes had less than 1 D of corneal astigmatism, while 3.1% had ≥ 3.0 D. Conclusions Less than 1 D of corneal astigmatism was present in the majority of cataract surgery candidates. 3.1% of eyes were candidates for a toric IOL. This study provides useful information on inventory requirements for planning hospital resources.