Comparison of corneal curvature and anterior chamber depth measurements using the manual keratometer, lenstar LS 900 and the pentacam

Uçakhan, Ömür Ö.; Akbel, Veysel; Biyikli, Zeynep; Kanpolat, Ayfer

doi:10.4103/0974-9233.114791

Cited by 27 publications

(18 citation statements)

References 15 publications

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“…Recently, Uçakhan et al compared the corneal curvature and ACD measurements using the Lenstar LS 900, Pentacam (Oculus, Wetzlar, Germany), and a manual keratometer in healthy eyes. 16 The authors reported good correlation between the Lenstar and Pentacam for measuring the ACD and corneal curvature.…”

Section: Discussionmentioning

confidence: 90%

Ocular biometric characteristics during the menstrual cycle

Çakmak¹,

Taşpınar²,

Ozbagcivan³

et al. 2015

OPTH

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PurposeTo determine the ocular biometric characteristics during the menstrual cycle using the optical low-coherence reflectometry (OLCR) biometry.MethodsTwenty-two healthy women between the ages of 19 and 36 years with regular menstrual cycles were enrolled in this prospective study. Subjects with irregular menstrual cycles, those taking contraceptive pills, those with a history of ocular surgery or trauma, and women unable to cooperate with the ocular biometry device were excluded from this study. A complete ophthalmic examination was performed between 8.30 and 10.30 am for all participants. Also, central corneal thickness, axial length, anterior chamber depth, lens thickness, and keratometric measurements were made at the same time using the OLCR device. Measurements were taken at the beginning of the cycle (1–3 days), at ovulation (12–16 days), and at the end of the cycle (26–32 days).ResultsThe mean age of the participants was 22.86±4.22 (range: 18–36) years. The difference in central corneal thickness, axial length, anterior chamber depth, lens thickness, and keratometry values were not statistically significant during the menstrual cycle.ConclusionThe ocular biometric parameters did not significantly vary during the menstrual cycle according to the OLCR biometry.

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Section: Discussionmentioning

confidence: 90%

Ocular biometric characteristics during the menstrual cycle

Çakmak¹,

Taşpınar²,

Ozbagcivan³

et al. 2015

OPTH

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“…In the present study, the mean Scheimpflug tomography derived keratometry value for eyes with apical scarring is 61.6 D, suggestive of more advanced disease. is discrepancy can be attributed to method of measurement, as Scheimpflug tomography readings may not correlate well with manual keratometry [11].…”

Section: Discussionmentioning

confidence: 99%

The Correlation between Corneal Findings and Disease Severity in Keratoconus per Scheimpflug Corneal Tomography

Shehata

Foster

Jun

et al. 2020

Journal of Ophthalmology

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is properly cited.Purpose. is study aims to correlate the clinical signs of keratoconus (KC) which include superficial apical scarring, Fleischer rings, and Vogt striae with best spectacle-corrected visual acuity (BSCVA) and corneal tomography findings. Patients and methods. A retrospective observational study. 72 consecutive KC patients seen by the senior author over the course of one year were included in this case series. Eyes with pellucid marginal degeneration, postrefractive ectasia, history of a corneal graft, prior corneal collagen cross-linking, intracorneal ring segments or hydrops were excluded from analysis. Subsequently, the final analysis included only treatment-naïve KC eyes with varying degrees of disease severity. Results. BSCVA with manifest refraction was 0.5 logMAR higher in eyes with apical scarring (p < 0.001). Eyes with apical scarring had worse vision than eyes with Fleischer rings alone (0.43 logMAR higher in the former, p < 0.009). Eyes with apical scarring had higher keratometry readings (K2 = 64.56 ± 12.89 D versus 49.07 ± 6.61 D, p < 0.001); this was also true for eyes with Fleischer rings compared with ring-free eyes (K2 = 56.23 ± 11.52 D versus 48.91 ± 7.79 D, p < 0.001) and eyes with Vogt striae (K2 = 56.19 ± 10.27 D versus 50.68 ± 9.21 D, p � 0.01). Atopic disease was a risk factor for scarring: odds ratio (OR) = 2.87 (p � 0.03). e OR of observing Fleischer rings in KC eyes was 12% per year (p � 0.001). Additionally, each mm of corneal apex displacement from the pupillary center led to a 0.76 logMAR increase in visual acuity (p � 0.001). Conclusion. e presence of apical scarring and Fleischer rings on biomicroscopy can aid the clinician in making the distinction between severe or long-standing disease (respectively). Apical scarring is a sign of advanced disease and is associated with worse BSCVA and tomography findings. Fleischer rings are markers of intermediate disease and their presence correlates with disease duration.

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“…Katarakt ameliyatı esnasında yerleştirilecek göziçi merceği gücünün hesaplanması, refraktif cerrahi yöntemi ile ilgili planlamaların yapılması, kontakt lens uygulamaları ve keratokonus gibi ektazik kornea hastalıklarının tanısının konulmasında keratometrik değerlerin oldukça hassas rolleri bulunmaktadır. [1][2][3][4][5][6] Günümüzdeki klinik uygulamalarda keratometrik ölçümlerin yapılması için manuel keratometre, otomatik keratometre, korneal topografi, Pentacam ve IOLMaster gibi birçok cihaz kullanılabilmektedir. Ancak her bir cihazın çalışma prensibi farklı olduğundan birbirleriyle olan uyumlulukları literatürdeki çeşitli çalışmalara konu olmuştur.…”

Section: Introductionunclassified

“…Ancak her bir cihazın çalışma prensibi farklı olduğundan birbirleriyle olan uyumlulukları literatürdeki çeşitli çalışmalara konu olmuştur. 1,4,7 Potec PRK-6000 (Potec Co. Ltd, Daejeon, Kore) refraksiyonun hızlı bir biçimde ölçümüne imkan sağlayan ve dokunmatik ekran fonksiyonuna sahip bir masaüstü otorefkeratometre cihazıdır. Cihaz aynı zamanda 10-85 milimetre arasındaki interpupiller mesafe ölçümüne de olanak sağlamaktadır.…”

Section: Introductionunclassified

Potec PRK-6000 Otorefraktometre, IOLMaster ve Pentacam ile Ölçülen Keratometri Değerlerinin Tekrarlanabilirliği ve Karşılaştırılması

Türk¹,

Arıcı²,

Ceylan³

et al. 2014

tjo

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Amaç: Potec PRK-6000 otorefraktometre, IOLMaster ve Pentacam ile ölçülen keratometri değerlerinin tekrarlanabilirliğini ve birbirleriyle olan uyumluluklarını araştırmak. Gereç ve Yöntem: Bu prospektif çalışmada refraksiyon kusuru dışında ek bir oküler patolojisi bulunmayan 55 olgunun 110 gözünde, iki farklı oturumda olmak üzere, bahsedilen üç cihaz ile ardışık ölçümler yapıldı. Her iki oturumda elde edilen düz ve dik keratometri, ortalama keratometri ile korneal astigmatizma değerlerinin tutarlılığı gözlem içi korelasyon katsayısı (ICC) kullanılarak kıyas edildi. Cihazlar arası ölçüm farklılıkları da istatistiksel olarak ayrıca karşılaştırıldı. Materials and Methods:In this prospective study, consecutive measurements were performed in two different sessions with the mentioned three devices on 110 eyes of 55 subjects who had no additional ocular pathology except for refraction error. The consistency of flat and steep keratometry, average keratometry, and corneal astigmatism values obtained in both sessions was compared by using intraclass correlation coefficient (ICC). The measurement differences between the devices were statistically compared as well. Results: The mean age of the study subjects was 23.05±3.01 (18-30) years. ICC values of average keratometry measurements obtained in the sessions were 0.996 for Potec PRK-6000 autorefractometer, 0.997 for IOL Master, and 0.999 for Pentacam. There was high compatibility between the three devices in terms of average keratometry values in Bland-Altman analysis. However, there were statistically significant differences between the devices in terms of parameters other than corneal astigmatism. Conclusion: The repeatability of the three devices was found considerably high in keratometry measurements. However, it is not appropriate for these devices to be substituted for each other in keratometry measurements. (Turk J Ophthalmol 2014; 44: 179-83)

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Comparison of corneal curvature and anterior chamber depth measurements using the manual keratometer, lenstar LS 900 and the pentacam

Cited by 27 publications

References 15 publications

Ocular biometric characteristics during the menstrual cycle

Ocular biometric characteristics during the menstrual cycle

The Correlation between Corneal Findings and Disease Severity in Keratoconus per Scheimpflug Corneal Tomography

Potec PRK-6000 Otorefraktometre, IOLMaster ve Pentacam ile Ölçülen Keratometri Değerlerinin Tekrarlanabilirliği ve Karşılaştırılması

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