• Publications
  • Influence
The Longitudinal Orthokeratology Research in Children (LORIC) in Hong Kong: A Pilot Study on Refractive Changes and Myopic Control
There was significant initial corneal flattening in the ortho-k group but no significant relationships were found between changes in Corneal power and changes in axial length and vitreous chamber depth and the relationships with changes of refractive errors, AL and VCD. Expand
Retardation of myopia in Orthokeratology (ROMIO) study: a 2-year randomized clinical trial.
  • P. Cho, S. Cheung
  • Medicine
  • Investigative ophthalmology & visual science
  • 11 October 2012
On average, subjects wearing ortho-k lenses had a slower increase in axial elongation by 43% compared with that of subjects wearing single-vision glasses, and younger children tended to have faster axial lengthening and may benefit from early orthi-k treatment. Expand
Factors affecting the central corneal thickness of Hong Kong-Chinese.
Central corneal thickness decreased with increasing age but the effect appeared to be due to differences in female subjects only, and was significantly correlated with intraocular pressure, but not with refractive error or corNEal curvatures. Expand
High Myopia–Partial Reduction Ortho-k: A 2-Year Randomized Study
This single-masked randomized study showed that PR ortho-k effectively slowed myopic progression in high myopes, and axial length elongation was 63% slower in PR ortha-k–treated children compared with children wearing spectacles. Expand
Myopia control using toric orthokeratology (TO-SEE study).
Toric ortho-k lenses can slow axial elongation effectively in myopic children with moderate-to-high astigmatism and can be correlated significantly with the initial age of the subjects. Expand
The Relation between Invasive and Noninvasive Tear Break-Up Time
An investigation into the extent of agreement between the TBUT and NITBUT methods of assessing tear stability indicated that these methods do not agree sufficiently closely; short average tear break-up values are associated with small differences between the measures, whereas long average tearbreak values areassociated with large differences among the measures. Expand
Endothelial cells analysis with the TOPCON specular microscope SP-2000P and IMAGEnet system
The clearest image with the retraced method for endothelial cell analysis with the IMAGEnet system is suggested, as the variability in hexagonality results between the first and the clearest images can be clinically significant. Expand
Central and peripheral corneal thickness measured with the TOPCON specular microscope SP-2000P
  • P. Cho, S. Cheung
  • Materials Science, Medicine
  • Current eye research
  • 1 January 2000
Differences in CT measurements obtained from the first and clearest images captured by the SP-2000P were not statistically significant but can be clinically significant for peripheral CT, which has relevance to the measurement of the cornea before and after refractive surgery. Expand
Microbial contamination of contact lenses and lens care accessories of soft contact lens wearers (university students) in Hong Kong
Purpose:  This study aimed to examine the rates of microbial contamination, and identify contaminants associated with contact lenses and lens care accessories used by a group of young contact lensExpand
Corneal shape of Hong Kong-Chinese.
It is found that while males have longer r0 than females, their p are not significantly different, and there was no correlation between p and r0 along the two principal meridians. Expand