Elisabeth J Cohen1. 1. Department of Ophthalmology, Jefferson Medical College, Thomas Jefferson University, and the Cornea Service, Wills Eye Institute, Philadelphia, Pennsylvania, USA.
Abstract
PURPOSE: To test the hypothesis that keratoconus and pellucid patients who have glaucoma or are suspected of having glaucoma have lower corneal hysteresis (CH) and/or corneal resistance factor (CRF) measurements compared to controls. METHODS: A prospective study at a tertiary eye center of keratoconus and pellucid patients with glaucoma or suspected of having glaucoma, and age-matched keratoconus and pellucid controls, was performed. After informed consent was obtained, corneal topography, ocular response analyzer measurements, pachymetry, intraocular pressure, A-scan measurements, Humphrey visual fields (VFs), and disc photos were done. Analyses compared cases to controls on primary (CH and CRF) and secondary variables. Disc photos and VFs were rated in a masked fashion. RESULTS: The mean CH (8.2, SD=1.6, vs 8.3, SD=1.5) and CRF (7.3, SD=2.0, vs 6.9, SD=2.1) were low and did not differ significantly between 20 study patients (29 eyes) and 40 control patients (61 eyes), respectively. CH had a negative, significant correlation with maximum corneal curvature by topography (P < .002) and positive, significant correlation with central corneal thickness (P < .003). The mean cup-disc ratio was larger among cases than controls (0.54, SD=0.20, vs 0.38, SD=0.20; P = .003). VFs were suggestive of glaucoma more often among the study eyes than controls (11 of 29, 37.9%, vs 8 of 60, 13.3%; P =.019). CONCLUSIONS: CH was low in study and control patients and was correlated with severity of keratoconus/pellucid, but not with glaucoma/suspected glaucoma or control status. Evidence of glaucoma was more common in study eyes than controls, but was present in both.
PURPOSE: To test the hypothesis that keratoconus and pellucidpatients who have glaucoma or are suspected of having glaucoma have lower corneal hysteresis (CH) and/or corneal resistance factor (CRF) measurements compared to controls. METHODS: A prospective study at a tertiary eye center of keratoconus and pellucidpatients with glaucoma or suspected of having glaucoma, and age-matched keratoconus and pellucid controls, was performed. After informed consent was obtained, corneal topography, ocular response analyzer measurements, pachymetry, intraocular pressure, A-scan measurements, Humphrey visual fields (VFs), and disc photos were done. Analyses compared cases to controls on primary (CH and CRF) and secondary variables. Disc photos and VFs were rated in a masked fashion. RESULTS: The mean CH (8.2, SD=1.6, vs 8.3, SD=1.5) and CRF (7.3, SD=2.0, vs 6.9, SD=2.1) were low and did not differ significantly between 20 study patients (29 eyes) and 40 control patients (61 eyes), respectively. CH had a negative, significant correlation with maximum corneal curvature by topography (P < .002) and positive, significant correlation with central corneal thickness (P < .003). The mean cup-disc ratio was larger among cases than controls (0.54, SD=0.20, vs 0.38, SD=0.20; P = .003). VFs were suggestive of glaucoma more often among the study eyes than controls (11 of 29, 37.9%, vs 8 of 60, 13.3%; P =.019). CONCLUSIONS: CH was low in study and control patients and was correlated with severity of keratoconus/pellucid, but not with glaucoma/suspected glaucoma or control status. Evidence of glaucoma was more common in study eyes than controls, but was present in both.
Authors: Aachal Kotecha; Ahmed Elsheikh; Cynthia R Roberts; Haogang Zhu; David F Garway-Heath Journal: Invest Ophthalmol Vis Sci Date: 2006-12 Impact factor: 4.799
Authors: Xiaohui Li; Yelena Bykhovskaya; Ana Laura Caiado Canedo; Talin Haritunians; David Siscovick; Anthony J Aldave; Loretta Szczotka-Flynn; Sudha K Iyengar; Jerome I Rotter; Kent D Taylor; Yaron S Rabinowitz Journal: Invest Ophthalmol Vis Sci Date: 2013-04-12 Impact factor: 4.799
Authors: Mustafa Değer Bilgeç; Eray Atalay; Ömer Sözer; Hüseyin Gürsoy; Muzaffer Bilgin; Nilgün Yıldırım Journal: Int Ophthalmol Date: 2019-12-02 Impact factor: 2.031
Authors: Yi Lu; Veronique Vitart; Kathryn P Burdon; Chiea Chuen Khor; Yelena Bykhovskaya; Alireza Mirshahi; Alex W Hewitt; Demelza Koehn; Pirro G Hysi; Wishal D Ramdas; Tanja Zeller; Eranga N Vithana; Belinda K Cornes; Wan-Ting Tay; E Shyong Tai; Ching-Yu Cheng; Jianjun Liu; Jia-Nee Foo; Seang Mei Saw; Gudmar Thorleifsson; Kari Stefansson; David P Dimasi; Richard A Mills; Jenny Mountain; Wei Ang; René Hoehn; Virginie J M Verhoeven; Franz Grus; Roger Wolfs; Raphaële Castagne; Karl J Lackner; Henriët Springelkamp; Jian Yang; Fridbert Jonasson; Dexter Y L Leung; Li J Chen; Clement C Y Tham; Igor Rudan; Zoran Vatavuk; Caroline Hayward; Jane Gibson; Angela J Cree; Alex MacLeod; Sarah Ennis; Ozren Polasek; Harry Campbell; James F Wilson; Ananth C Viswanathan; Brian Fleck; Xiaohui Li; David Siscovick; Kent D Taylor; Jerome I Rotter; Seyhan Yazar; Megan Ulmer; Jun Li; Brian L Yaspan; Ayse B Ozel; Julia E Richards; Sayoko E Moroi; Jonathan L Haines; Jae H Kang; Louis R Pasquale; R Rand Allingham; Allison Ashley-Koch; Paul Mitchell; Jie Jin Wang; Alan F Wright; Craig Pennell; Timothy D Spector; Terri L Young; Caroline C W Klaver; Nicholas G Martin; Grant W Montgomery; Michael G Anderson; Tin Aung; Colin E Willoughby; Janey L Wiggs; Chi P Pang; Unnur Thorsteinsdottir; Andrew J Lotery; Christopher J Hammond; Cornelia M van Duijn; Michael A Hauser; Yaron S Rabinowitz; Norbert Pfeiffer; David A Mackey; Jamie E Craig; Stuart Macgregor; Tien Y Wong Journal: Nat Genet Date: 2013-01-06 Impact factor: 38.330
Authors: Khaled K Abu-Amero; Inas Helwa; Abdulrahman Al-Muammar; Shelby Strickland; Michael A Hauser; R Rand Allingham; Yutao Liu Journal: J Negat Results Biomed Date: 2015-06-04
Authors: Mallika Prem Senthil; Lachlan S W Knight; Deepa Taranath; David A Mackey; Jonathan B Ruddle; Mark Y Chiang; Owen M Siggs; Emmanuelle Souzeau; Jamie E Craig Journal: Cornea Date: 2022-03-30 Impact factor: 3.152