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Biomedical subjects

Arthur C K Cheng

Publications and source records attributed to Arthur C K Cheng.

44 records · Page 3Linked to original sources
PubMed2002

Bilateral peripheral corneal infiltrates after simultaneous myopic laser in situ keratomileusis.

We describe a patient with multiple superior corneal infiltrates in both eyes, separated from the limbus by an intervening clear zone, that appeared 1 day after uneventful laser in situ keratomileusis. The overlying epithelium was intact, and the flap and interface were uninvolved. Based on these features, a clinical diagnosis of sterile corneal infiltrates was made and the eyes were treated with topical antibiotics and steroids. The infiltrates resolved during the ensuing weeks without corneal scarring. Good visual acuity was maintained. Recognition of this benign complication is important because aggressive corneal scrapings are not required. The infiltrates appear to be immunogenic in origin, although the exact etiopathogenesis is not clear.

Administration, Topical↗
PubMedDate not supplied

Multistage approach to uveitic cataract management in children.

Phototherapeutic keratectomy, cataract extraction and hydrophobic acrylic lens implantation, Nd:YAG laser capsulotomy, glaucoma valve implantation, and intravitreal steroid injections resulted in substantial visual improvement in three eyes of two children with complicated cataract due to severe uveitis. At follow-up of 6 months to 4 years, the children had clear corneas and normal intraocular pressures.

Cataract↗
PubMedDate not supplied

Comparison of the Colvard pupillometer and the Zywave for measuring scotopic pupil diameter.

PURPOSE: To evaluate the accuracy and repeatability of two pupillometers. METHODS: Two pupillometers, the Colvard and Zywave, were used to measure scotopic pupil diameter for 64 consecutive patients. Accuracy and repeatability were assessed by two independent examiners and statistical analysis was performed using the comparison method described by Bland and Altman. RESULTS: Mean scotopic pupil diameter was 5.96 +/- 0.69 mm with the Colvard pupillometer and 5.77 +/- 0.85 mm with the Zywave. The difference between the Colvard and Zywave measurements was 0.21 +/- 0.56 mm (P < .001). The coefficient of interrater repeatability was smaller for the Colvard (0.59) than for the Zywave (1.17). The mean difference between the pupillometers for each examiner was 0.17 +/- 0.47 mm (P < .01) for examiner 1 and 0.26 +/- 0.64 mm (P < .01) for examiner 2. CONCLUSIONS: Scotopic pupil diameter measured with the Zywave was statistically but not clinically significantly smaller than that measured with the Colvard pupillometer. The Zywave produced an inter-rater repeatability comparable to other devices although not as good as the Colvard pupillometer.

Adult↗
PubMedDate not supplied

Central island treatment using Technolas 217 based on Orbscan II assessment.

PURPOSE: To present a case of central island after myopic laser in situ keratomileusis and the treatment technique using Technolas 217 laser based on topography findings. METHODS: Serial corneal topographies with Orbscan were taken and an ablation profile was generated with subsequent treatment using the phototherapeutic keratectomy mode and surface ablation technique. RESULTS: Marked reduction was noted in the height of central island and the best spectacle-corrected visual acuity improved from 20/40 to 20/25. CONCLUSIONS: Ablation profile based on corneal topography can provide a possible treatment option for patients with central island.

Adult↗
PubMedDate not supplied

Keratometry for intraocular lens power calculation using Orbscan II in eyes with laser in situ keratomileusis.

PURPOSE: To compare the results of comeal keratometry after laser in situ keratomileusis (LASIK) obtained by the Gaussian optics formula and the clinical history method. METHODS: Sixty-one consecutive patients (121 eyes) who had undergone LASIK were recruited in this retrospective case-controlled study. The K-value obtained from the Gaussian optics formula (CalK) based on postoperative corneal topography by Orbscan II (Bausch & Lomb, Rochester, NY) and ultrasound pachymetry was compared with that obtained from the clinical history method (estK). Keratometry measured by these two methods was compared using the paired sample t test and Pearson correlation coefficient. RESULTS: A high correlation was noted between K-value obtained by the clinical history method and the Gaussian optics formula (R = 0.97, P < .001). The mean difference between the two methods is 0.13 diopters (P = .06). CONCLUSIONS: K reading derived from the Gaussian optics formula correlated closely to that obtained from the clinical history method and would be especially useful in patients with no preoperative LASIK treatment data.

Adult↗