Research Update

Research Update Issue 21

September 2018

Eye & Contact Lens, the official journal of the Contact Lens Association of Ophthalmologists (CLAO), and Myopia Society Japan collaborated to present the symposium 

September 2018  

Welcome to our monthly research update
Research Update is a resource available exclusively to IACLE and BCLA members to support your teaching and practice. Each month we send you a summary of some of the interesting findings appearing in peer-reviewed journals that month. Our aim is to help you keep up to date with the latest contact lens and anterior eye research, and to locate articles when you want to know more about a particular topic.
More information on Research Update and how to use it in your contact lens teaching here. Access archived issues via Member Login under Research.
Special Issue – September 2018
Controlling Myopia Progression: Where Do We Stand Today?

Eye & Contact Lens, the official journal of the Contact Lens Association of Ophthalmologists (CLAO), and Myopia Society Japan collaborated to present the symposium: Controlling Myopia Progression: Where Do We Stand Today? These reviews and original studies arose from the symposium, and include additional articles commissioned to expand on some topics.

This second and concluding issue is devoted to myopia and orthokeratology topics. The ability of initial assessment to predict short-term visual performance with myopia control lenses and the potential for manipulating light environments to prevent myopia are explored. Orthokeratology studies include the use of trial fitting vs software fitting, compliance behaviour, and vision performance and optical quality after treatment.

Here are some excerpts from the issue.

The IACLE Education Team
Journal reviewed in this issue  
  Eye & Contact Lens 44:5

Does initial assessment predict vision performance?
Diec et al conducted this randomized, cross-over, dispensing trial to investigate whether initial assessment of contact lenses prescribed for myopia control (MC) predicts short-term visual performance. Analysis of 43 participants wearing at least one lens: single-vision (SV) lens or MC lenses was performed. Initial performance at fitting did not predict short-term performance for SV or MC lenses. A significant increase in willingness to purchase if lenses slowed myopia progression was observed while wearing MC lenses. Educating patients on the benefits might increase acceptability of MC lenses.

Eye & Contact Lens 2018;44:5 308-315. Click here for abstract


Myopia control by light environments
In this review, Jiang et al discuss the evidence and possibilities for controlling myopia through light environments. The difference between indoor and outdoor light environments, such as intensity and wavelength of modern electronic lighting equipment, may be a cue for myopia control. Less than 40 min per day of outdoor light exposure may be a risk factor in faster axial eye growth in children. Manipulating light environment is the most practical way to prevent myopia. Generally, approximately 2 h of outdoor light exposure per day is recommended.

Eye & Contact Lens 2018;44:5 273-278. Click here for full text


Trial fitting vs software fitting for OrthoK
To compare the efficacy of 1-year trial fitting and software fitting for orthokeratology lenses, Lu et al randomly assigned 100 myopes (-1.00 to -4.50DS, up to -1.50DC) aged 8-14 years into two groups: a trial fitting group and software fitting group. Both approaches were effective in temporarily reducing myopia, providing good uncorrected VA and delaying elongation of axial length for moderate and high myopic adolescents. Trial fitting checks whether wearing an OrthoK lens is acceptable for patients, whereas the software approach would improve the efficiency of fitting and reduce the difficulty of training for clinicians.

Eye & Contact Lens 2018;44:5 339-343. Click here for abstract


OrthoK and CL Quality of Life (OCL-QoL) questionnaire
McAlinden et al developed a 45-item OCL-QoL questionnaire from literature review, focus groups, and interviews. A total of 234 participants fitted with contact lenses (OrthoK, soft and gas permeable) or spectacles completed the pilot questionnaire. After Rasch analysis, the final questionnaire contained 23 items. The questionnaire had exceptional psychometric properties and is valid for use in clinical practice, clinical trials, and research studies. The tool is scored on a 0-100 interval level scale with higher scores indicating better QoL.

Eye & Contact Lens 2018;44:5 279-285. Click here for abstract


Non-compliant behaviours in OrthoK
To investigate compliance with orthokeratology guidelines, Jun et al surveyed 1,500 patients in China aged 9-22 years who had worn OrthoK lenses for more than 1 year. Among the 405 respondents, the full compliance rate was 14%, compliance with wear and care behaviors was 18%, and compliance with follow-up visits was 63%. The most common non-compliant behaviors were exposure to non-sterile solution, not removing lens deposits and inadequate hand washing. Practitioners need to emphasize the details of lens wear and care, especially avoiding exposing lenses to non-sterile solution, and the importance of follow-up.

Eye & Contact Lens 2018;44:5 330-334. Click here for full text


Effects on visual performance and optical quality
This prospective study by Liu et al investigated the correlation between amount of lens decentration, size of treatment zone (TxZ), and changes in visual performance and optical quality in myopes (-0.75 to -5.50DS, up to -1.50DC) aged 9-14 years undergoing OrthoK. Visual performance of 27 eyes of 27 patients wearing OrthoK lenses was compared before and 1 month after OrthoK treatment. Visual and optical quality decreases after OrthoK, which can be alleviated by a larger TxZ diameter and a smaller lens decentration.

Eye & Contact Lens 2018;44:5 316-321. Click here for full text

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