Research Update

Research Update Issue 10

October 2017  

Welcome to our monthly research update
Welcome to Research Update, a new resource available to IACLE and BCLA members to support your teaching and practice. Each month we will 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.
Issue 10 – October 2017
The influence of lens care products on contact lens comfort has been a topic of discussion recently. This month we look at the effects of multipurpose solutions on hydrogel lens performance. Click on the abstract to find out which solutions were tested. And we join the debate on an important question often asked in practice: ‘What is the appropriate frequency for CL aftercare visits?’

Two studies relate to the interaction between soft CLs and cosmetic products: one on diffusion of eye shadow and another on absorption of cleansing oil. Is there merit in using topical anaesthetic prior to RGP lens fitting? A new study answers this age-old question. We report a study that examines accommodative response of eyes wearing aspheric single-vision contact lenses. And finally, we include a comprehensive review of intracorneal inlays for correcting presbyopia.

Enjoy this month’s update!

The IACLE Education Team
Journals reviewed in this issue  

  Optometry & Vision Science Pre-publication, 94:10
  Clinical & Experimental Optometry 100:5
  Contact Lens & Anterior Eye 40:5, Articles in Press
  Eye & Contact Lens 43:5

Multipurpose solutions and hydrogel lens performance
In this prospective, double-masked, randomized, crossover study, Kitamata-Wong et al investigated short-term effects of modern multipurpose solutions (MPS) on CL comfort and dryness, pre-lens tear film stability and ocular surface health, in addition to solution effects on CL surface properties in vitro. Over four visits, subjects were exposed to control solution in one eye and to one of four test solutions in the contralateral eye, for 2h using presoaked lenses. Different MPS showed different effects on the ocular surface. The effect of MPS on CL properties in vitro reflect how the MPS altered pre-lens tear stability.

Optom Vis Sci 2017;DOI: 10.1097/OPX.0000000000001125. Click here for abstract


Rethinking contact lens aftercare frequency
Efron and Morgan conducted this review to rethink CL aftercare in a modern context and explore two overarching issues: the key reasons for conducting aftercare examinations and the appropriate frequency for aftercare visits. Four key clinical reasons for conducting a routine aftercare visit are identified: preserving ocular health, maintaining good vision, optimizing comfort and ensuring satisfactory fitting performance. The authors recommend: first aftercare visit within 1-2 weeks of lens dispensing. Follow-up guidelines are: soft daily disposable, 24 months; soft daily reusable and rigid daily wear, 12 months; soft and rigid extended wear, six months.

Clin Exp Optom 2017;100:5 411-431. Click here for full text


Diffusion of eye shadow in soft contact lenses
Tavazzi et al quantified and compared absorption of the dye component of a powder eyeshadow into soft CLs of five hydrogel and four silicone hydrogel (SiHy) materials. Diffusivity was higher in SiHys than in hydrogels. In hydrogels, diffusivity was greater in materials with lower oxygen transmissibility. Diffusion of dye was found to follow Fick’s law and is driven by polymer-dye interaction, which governs lens hydration and swelling. Based on results with one specific cosmetic, SiHys were found to be not recommended for prolonged wear for eyeshadow wearers.

Cont Lens Anterior Eye 2017;40:5 335-339. Click here for full text


Cleansing oil absorption by soft contact lenses
This study by Tsukiyama et al investigated absorption of a cosmetic product by three brands of hydrogel and seven brands of SiHy contact lenses (SHCLs) along with the degree of differences between these dry and wet states. The cleansing oil (for removing make-up) was not absorbed by hydrogel lenses under wet or dry conditions. SHCLs exhibited different degrees of resistance depending on the lens material. Some SHCLs absorbed cosmetic cleansing oil more under dry conditions than under wet conditions

Eye & Contact Lens 2017;43:5 318-323. Click here for full text


Topical anaesthetic use prior to RGP lens fitting
To investigate the effect of topical anaesthetic (TA) during rigid gas-permeable (RGP) CL fitting on subjective and objective measures of patient anxiety, Gill et al conducted this prospective, randomised, double-masked study among 47 subjects at two visits scheduled one week apart. Use of TA in RGP CL fitting was shown to be a clinically safe practice that may enhance first RGP CL experience especially in anxious patients, reduce anxiety during the adaptation period, and reduce anxiety prior to subsequent RGP CL wear.

Cont Lens Anterior Eye 2017;DOI: Click here for full text


Accommodative behaviour of eyes wearing aspheric CLs
To examine the accommodative response of young eyes wearing aspheric single-vision CLs, Altoaimi et al measured accommodation behaviour in eight young adult eyes using the Shack-Hartmann aberrometer. Near vision pupil miosis was sufficient to counteract the increasing negative spherical aberration induced by the accommodating crystalline lens. Aspheric CLs designed to correct some or all of the unaccommodated eye’s positive spherical aberration do not interfere with accommodation.

Optom Vis Sci 2017;94:10 971-980. Click here for abstract


Intracorneal inlays for correction of presbyopia
In this review article, Binder analyses the history and development of various inlay approaches designed to correct presbyopia. Recent surgical approaches include intracorneal inlays. Inlay approaches include increasing corneal curvature alone, implanting a multifocal inlay, or implanting a small-aperture device that functions as a pinhole to restore unaided near and intermediate visual acuity. Unlike other refractive surgical approaches, these newer techniques are removable. Technological advancements have produced predictable and safer clinical results compared with previous intracorneal inlays.

Eye & Contact Lens 2017;43:5 267-275. Click here for abstract

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