Corneal thickness measurements with the Orbscan Topography System and ultrasonic pachymetry

Yaylalı, Volkan; Kaufman, Stephen C.; Thompson, Hilary W.

doi:10.1016/s0886-3350(97)80113-7

Cited by 223 publications

(116 citation statements)

References 9 publications

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“…[12][13][14] In this study, corneal topography (Allegro Oculyzer, WaveLight AG, Erlangen, Germany) was conducted with undilated pupils under scotopic conditions by a single experienced technician. Scans were taken in automatic mode with proper quality.…”

Section: Examinationsmentioning

confidence: 99%

Factors affecting outcomes of corneal collagen crosslinking treatment

Toprak

Yaylalı

Yıldırım

2013

Eye

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Purpose To assess the effects of preoperative patient characteristics on clinical outcomes of corneal crosslinking (CXL) treatment in patients with progressive keratoconus. Methods This retrospective study comprised 96 eyes of 96 patients who had unilateral CXL treatment for progressive keratoconus. All patients underwent a complete ophthalmological examination and corneal topography at baseline and 1 year. Subgroup analyses were performed according to the age (o30 andZ30 years), gender, preoperative corrected distance visual acuity (CDVA, o0.3 and Z0.3 logMAR (log of the minimum angle of resolution)), preoperative maximum keratometry (K, o54 and Z54 D), baseline topographic cone location (central, paracentral, and peripheral), and preoperative thinnest pachymetry (o450 and Z450 mm) to determine the associations between preoperative patient characteristics and outcomes (changes in visual acuity and maximum keratometry) of CXL treatment. Results In the entire study population, mean CDVA and maximum K significantly improved after CXL treatment (Po0.001). Patients with a preoperative CDVA of 20/40 Snellen equivalent or worse (Z0.3 logMAR) experienced more visual improvement after CXL treatment (Po0.001). However, an age Z30 years and a baseline thinnest pachymetry less than 450 mm were found significantly associated with more flattening in maximum keratometry (P ¼ 0.024, P ¼ 0.005 respectively). Gender, preoperative maximum K, and baseline topographic cone location did not show significant effect on postoperative visual acuity and maximum keratometry (P40.05). Conclusions In patients with progressive keratoconus, age, baseline visual acuity, and baseline thinnest pachymetry seem to affect the success of the CXL treatment.

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Section: Examinationsmentioning

confidence: 99%

Factors affecting outcomes of corneal collagen crosslinking treatment

Toprak

Yaylalı

Yıldırım

2013

Eye

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“…Other studies have therefore looked at slit-scanning and optical coherence techniques and compared them with US. [3][4][5][6][7] In a recent study undertaken on Chinese individuals, Wong et al 6 suggest that the results obtained with Orbscan and US are comparable clinically. This finding is not supported by previous studies, and we therefore undertook a similar study in Europeans to see whether these results could be duplicated.…”

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confidence: 99%

Comparison of Orbscan and Ultrasound pachymetry in the measurement of central corneal thickness

Radford

Lim

Salmon

2004

Eye

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Measurement of central corneal thickness (CCT) is of ever increasing importance to glaucoma specialists. Studies indicate that measurements of intraocular pressure (IOP), especially when taken by applanation tonometry, are influenced by corneal thickness. A recent meta-analysis showed that a 10% difference in CCT would result in an average of 3.470.9 mmHg difference in IOP (1.1 mmHg for normal eyes, 2.5 mmHg for chronically diseased eyes, and 10.0 mmHg in eyes with acute onset active disease).

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“…Ultrasound Techniques which most commonly in use are Conventional Ultrasonic Pachymetry & Ultrasound Biomocroscopy (UBM). [7] Optical Techniques include Manual optical pachymetry, Specular microscopy, [8] Scanning slit lamp corneal topography, [9] Optical Coherence Tomography, [10] Optical low coherence interferometry, [11] Confocal microscopy, [12] Laser Doppler interferometry. Recent techniques like Pentacam, Pachycam, Ocular Response Analyzer (ORA) are also in use.…”

Section: Discussionmentioning

confidence: 99%