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Arthur C K Cheng

Publications and source records attributed to Arthur C K Cheng.

At least 37 records · Page 2Linked to original sources
PubMed2005

Intraocular pressure measurement in patients with previous LASIK surgery using pressure phosphene tonometer.

PURPOSE: To compare intraocular pressure (IOP) assessment in post-LASIK patients using non-contact tonometry, pressure phosphene tonometry and applanation tonometry. METHODS: Sixty-two consecutive LASIK patients were analysed preoperatively and postoperatively with non-contact, pressure phosphene and applanation tonometry. Comparisons among these values were assessed with paired sample Student t-test, Pearson's correlation test and Bland-Altman plotting. RESULTS: There was no significant difference for preoperative IOP measurement between non-contact, pressure phosphene and applanation tonometry. The mean +/-SD difference between the preoperative non-contact tonometry and postoperative pressure phosphene tonometry IOP measurements was 0.80 +/- 2.77 mmHg (P < 0.01). Postoperative applanation tonometry significantly underestimated IOP measurement by 5.45 +/- 2.96 mmHg (P < 0.001) and postoperative non-contact tonometry significantly underestimated IOP measurement by 9.96 +/- 2.25 mmHg (P < 0.001). CONCLUSION: Pressure phosphene tonometry may provide an alternative method for the assessment of IOP in post-LASIK patients.

Adult↗
PubMed2004

Effect of alcohol on the efficacy of excimer laser power.

PURPOSE: To evaluate the effect of various alcohol concentrations on excimer laser power. SETTING: University Eye Clinic, The Chinese University of Hong Kong, Hong Kong, China. METHODS: The fluency of the Technolas 217z laser (Bausch & Lomb) was calibrated according to the standard calibration procedure. The effect of ethanol 20%, 40%, 60%, and 80% and sodium hypochlorite 0.06% solutions on laser fluency was assessed in 5 experiments. RESULTS: Ethanol concentrations of 20% and 40% had no significant effect on laser fluency. Ethanol concentrations of 60% and 80% reduced fluency to 97.6%. Sodium hypochlorite had no effect on laser fluency. CONCLUSIONS: A high concentration of ethanol affected laser fluency and should be avoided in the operating theater. Ethanol 20%, which is commonly used during laser-assisted subepithelial keratectomy, did not affect laser fluency.

Ethanol↗
PubMed2004

In vivo confocal microscopic findings in patients with steroid-induced glaucoma after LASIK.

OBJECTIVE: To report the confocal microscopic findings of 2 different cases of steroid-induced glaucoma after LASIK. DESIGN: Observational case report of 2 cases. METHODS: Two cases of steroid-induced glaucoma after LASIK were selected. Examination with a white-light tandem slit-scanning confocal microscope was performed in addition to routine slit-lamp biomicroscopy. MAIN OUTCOME MEASURES: In vivo confocal findings at the flap interface. RESULTS: In both cases, the interfaces were identified at a deeper level than expected. Confocal microscopic examination did not show mononuclear cells and granulocytes typically seen in patients with classic diffuse lamellar keratitis. CONCLUSION: Our findings confirm that steroid-induced glaucoma after LASIK is not associated with the collection of inflammatory cells. The treatment option of lowering the intraocular pressure is effective in treating the disease, even without anti-inflammatory medications. Confocal in vivo microscopy is a useful tool to study the course of steroid-induced glaucoma after LASIK in humans.

Adult↗