Xiaoyan Han1,2,3,4, Qi Fan1,2,3,4, Zhixiang Hua1,2,3,4, Xiaodi Qiu1,2,3,4, Dongjin Qian1,2,3,4, Jin Yang5,6,7,8,9. 1. Eye Institute and Department of Ophthalmology, Eye and Ear, Nose, and Throat Hospital, Fudan University, 200031, Shanghai, China. 2. The Key Laboratory of Myopia, Ministry of Health, 200031, Shanghai, China. 3. Shanghai Key Laboratory of Visual Impairment and Restoration, 200031, Shanghai, China. 4. Visual Rehabilitation Professional Committee, Chinese Association of Rehabilitation Medicine, 200031, Shanghai, China. 5. Eye Institute and Department of Ophthalmology, Eye and Ear, Nose, and Throat Hospital, Fudan University, 200031, Shanghai, China. jin_er76@hotmail.com. 6. The Key Laboratory of Myopia, Ministry of Health, 200031, Shanghai, China. jin_er76@hotmail.com. 7. Shanghai Key Laboratory of Visual Impairment and Restoration, 200031, Shanghai, China. jin_er76@hotmail.com. 8. Visual Rehabilitation Professional Committee, Chinese Association of Rehabilitation Medicine, 200031, Shanghai, China. jin_er76@hotmail.com. 9. Department of Ophthalmology, Eye and ENT Hospital of Fudan University, 83 Fenyang Rd, 200031, Shanghai, China. jin_er76@hotmail.com.
Abstract
BACKGROUND: To investigate the distribution of corneal astigmatism, aberration, and biometric parameters in Chinese congenital cataract (CC) /developmental cataract patients before cataract surgery. METHODS: We evaluated eyes of CC /developmental cataract patients scheduled for cataract surgery from January 2016 to September 2019. Astigmatism, aberrations, and biometric parameters were measured with the Pentacam Scheimpflug imaging device (Pentacam HR, Oculus). Cataract was diagnosed and classified by slit-lamp examination after full mydriasis. RESULTS: We evaluated 538 eyes in 356 patients. The mean values of anterior corneal astigmatism (ACA), posterior corneal astigmatism (PCA), and total corneal astigmatism (TCA) were determined as 1.98 ± 1.06 D (range 0.0‒4.8 D), 0.49 ± 0.26 D (range 0.0‒1.9 D), and 2.09 ± 1.19 D (range 0.2‒8.8 D), respectively. ACA and TCA ≥ 1.25 D was present in 379 eyes (70.3%) and 392 eyes (72.8%), respectively. PCA between 0.25 D and 0.75 D was found in 380 eyes (70.6%). There was a statistically significant positive linear correlation between lower-order aberrations root mean square values (LOA RMS) and corneal astigmatism (CA). Furthermore, in terms of distribution of central cornea thickness, anterior chamber depth, ACA, PCA, and TCA in different types of cataracts, ACA was highest in patients with zonular cataracts. Finally, we found anterior corneal measurements may overestimate WTR astigmatism, underestimate ATR astigmatism, and underestimate oblique astigmatism, respectively. CONCLUSIONS: Most CC /developmental cataract patients had moderate to high astigmatism and ACA accounted for the largest proportion in the zonular group. This can provide a basis for planning of CC/developmental cataract surgery by ophthalmologists in clinical practice.
BACKGROUND: To investigate the distribution of corneal astigmatism, aberration, and biometric parameters in Chinese congenital cataract (CC) /developmental cataractpatients before cataract surgery. METHODS: We evaluated eyes of CC /developmental cataractpatients scheduled for cataract surgery from January 2016 to September 2019. Astigmatism, aberrations, and biometric parameters were measured with the Pentacam Scheimpflug imaging device (Pentacam HR, Oculus). Cataract was diagnosed and classified by slit-lamp examination after full mydriasis. RESULTS: We evaluated 538 eyes in 356 patients. The mean values of anterior corneal astigmatism (ACA), posterior corneal astigmatism (PCA), and total corneal astigmatism (TCA) were determined as 1.98 ± 1.06 D (range 0.0‒4.8 D), 0.49 ± 0.26 D (range 0.0‒1.9 D), and 2.09 ± 1.19 D (range 0.2‒8.8 D), respectively. ACA and TCA ≥ 1.25 D was present in 379 eyes (70.3%) and 392 eyes (72.8%), respectively. PCA between 0.25 D and 0.75 D was found in 380 eyes (70.6%). There was a statistically significant positive linear correlation between lower-order aberrations root mean square values (LOA RMS) and corneal astigmatism (CA). Furthermore, in terms of distribution of central cornea thickness, anterior chamber depth, ACA, PCA, and TCA in different types of cataracts, ACA was highest in patients with zonular cataracts. Finally, we found anterior corneal measurements may overestimate WTR astigmatism, underestimate ATRastigmatism, and underestimate oblique astigmatism, respectively. CONCLUSIONS: Most CC /developmental cataractpatients had moderate to high astigmatism and ACA accounted for the largest proportion in the zonular group. This can provide a basis for planning of CC/developmental cataract surgery by ophthalmologists in clinical practice.
Authors: Luis Amaya; David Taylor; Isabelle Russell-Eggitt; Ken K Nischal; Dora Lengyel Journal: Surv Ophthalmol Date: 2003 Mar-Apr Impact factor: 6.048
Authors: Douglas D Koch; Shazia F Ali; Mitchell P Weikert; Mariko Shirayama; Richard Jenkins; Li Wang Journal: J Cataract Refract Surg Date: 2012-10-12 Impact factor: 3.351