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Each January, we publish our Annual
Report in Contact Lens Spectrum (http://www.clspectrum.com/articleviewer.aspx?articleid=106550)
that summarizes the contact lens market as best we can for the prior year. Similarly,
we also publish a "Contact Lens Event" of the prior year—something that we
think stands out in the field of contact lenses and should be noted as such. It's
traditional for us to solicit for nomination for this event from our readership.
If you have any such nomination—something you think is substantial in the
contact lens field and occurred in 2012—please let us know by emailing me
directly at jnichols@optometry.uh.edu.
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Hikaru Hamano, MD passed away on October 26,
2012. He was eighty-eight years old.
A legend in his home country of Japan, he founded the largest contact lens practice
in the country, but Dr. Hamano's contributions to contact lens research were global
in impact and scope. He co-authored the book Corneal Physiology and Disposable Contact
Lenses, which supports the use of daily disposable contact lenses, and authored
numerous other research publications which contributed to the development of contact
lenses as we know them today.
Beginning in the early 1970s, Dr. Hamano focused research on the importance of oxygen
to the cornea and on how contact lens wear affects the corneal epithelium, corneal
nerves and tear composition.1 He was among the first in the world to
demonstrate the partial oxygen pressure on the cornea under PMMA lenses.1
The size of his practice enabled him conduct large scale clinical studies to validate
basic findings on the importance of oxygen transmission to the cornea and examine
the properties of new lenses. A study he performed in 19942 comparing
complication rates of various contact lens modalities in 23,000 patients, helped
to establish the improved benefits of the daily disposable modality.1
1. Schaeffer J, Beiting J. Key Developments
in Contact Lens Materials and Design, 1975-2000. Contact Lens Pioneers, a supplement
to Review of Optometry, September 2007
2. Hamano H, Watanabe K, Hamano T, et al. A study of the complications induced by
conventional and disposable contact lenses. CLAO J 1994;20(2):103-8.
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The email address for contacting us at Contact
Lenses Today has changed. Whether you are submitting news, fitting tips or
commentary, please contact us at
cltoday@pentavisionmedia.com. Company representatives and readers, please update
your address book and keep us posted.
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CooperVision, Inc. plans to launch a new website
in partnership with the Armed Forces Optometric Society (AFOS), reinforcing the
global contact lens manufacturer's commitment to serving the U.S. military community.
With this new website, military personnel and their families can learn more about
CooperVision's extensive product portfolio, purchase CooperVision's contact lenses
affordably, and be assured guaranteed delivery wherever they are located around
the world.
In addition, CooperVision plans to offer patients the option to support the Wounded
Warrior Project (WWP) by donating $1 per carton for each purchase of CooperVision
contact lenses. The Wounded Warrior Project takes a holistic approach when serving
the military community and their families to nurture the mind and body, and encourage
economic empowerment and engagement.
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AFOS was created in 1970 to advance the science
of eye care throughout the world. Today the society has more than 1,200 military
and federal doctors of optometry across the country and internationally. AFOS has
the largest group of Vision Scientists worldwide, and strives to elevate the standards
of eye care for the benefit of men, women and children everywhere.
For more information please visit
www.afos2020.org.
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Plan Now to Attend GSLS 2013 in January
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Plan now to attend the Global Specialty Lens Symposium January 24-27, 2013, at the
Rio All Suites Hotel and Casino, Las Vegas, Nevada. With an expert international
faculty and a CE-accredited agenda, the 2013 GSLS will include a fundamentals pre-conference,
insightful presentations by experts in the field, hands-on demonstrations of cutting-edge
products, as well as scientific papers and posters and networking opportunities
with your colleagues from over 30 different countries.
Look for more detailed information in future issues of Contact Lens Spectrum and
online at www.GSLSymposium.com.
--ADVERTISING
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With Bausch + Lomb's KeraSoft IC silicone hydrogel
contact lenses and Paragon Vision Sciences' ICD (irregular corneal design) 16.5mm
scleral lens now available through ABB CONCISE, the company is supporting its customers
by providing the opportunities to participate in active learning on the fitting
of these lenses.
Accounts can complete the necessary training to become a certified KeraSoft IC professional
by going to abbconcise.com and clicking on the KeraSoft IC banner advertisement.
That will lead to a page with information about the lens and the link to the certification
tutorial. Upon completion of the online training, accounts can contact ABB CONCISE's
Contact Lens Consultation for trial set information and to place KeraSoft IC orders.
Due the interest in the ICD 16.5 scleral lens, ABB CONCISE, with the support of
Paragon Vision Sciences, will be offering a second exclusive one and a half hour
training webinar on Wednesday, November 21st, at 6:00pm PST (9:00pm EST) with Patrick
Caroline, FAAO of Pacific University, called Contemporary Scleral Lens Design and
Fitting.
ABB CONCISE accounts can register for the webinar online at www2.gotomeeting.com/register/591257546. To obtain further
information about the webinar, accounts can email gpcustomsoftlenssupport@abbconcise.com with their account
information. Accounts interested in learning more about the lens or placing orders
can contact ABB CONCISE's Contact Lens Consultation at 800-772-3911 CA or 800-225-1812
MA, choose option 4.
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Post-Graft GP Fit
By Marco Tovaglia, Vittuone,
Italy
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A post-graft is a great challenge for a contact lens practitioner. This patient
was managed with a back surface toric GP contact lens with a special reverse progression
in the peripheral area. The result is excellent vision quality and contact lens-cornea
relationship.
We thank Marco Tovaglia for his photo and welcome photo submissions from our other
readers! It is easy to submit a photo for consideration for publishing in Contact
Lenses Today. Simply visit http://www.cltoday.com/upload/upload.aspx to upload
your image. Please include an explanation of the photo and your full name, degree
or title and city/state/country.
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MATERIALS & DESIGNS
Ronald K. Watanabe, OD,
FAAO
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New Sclerals
I ran across a couple of new products at this year's
Academy Meeting: Paragon NormalEyes 15.5 and X-Cel Atlantis scleral lenses. The
NormalEyes 15.5 lens has the Proximity Control and Dual Axis features found in their
CRT design. Proximity Control consists of a sigmoid return zone and an aspheric
landing zone that work together to create a tangent landing on the conjunctiva with
predictable conjunctival compression. The Dual Axis feature helps control lens flexure
and centration for those toric scleras. The parameters are laser marked to make
lens identification easier.
The Atlantis lens has three zones with proprietary radii of curvature that can be
independently controlled. The Central Zone is designed to clear the cornea, but
may have the least impact on the lens fit. The Limbal Zone is designed to vault
the limbus and is available in 5 radii that alter the overall sagittal depth in
25 micron steps. The Scleral Zone aligns with the sclera and comes in 4 radii that
alter the sag in 50 micron steps. Atlantis is available in 15.0, 16.0 and 16.5 mm
diameters.
No one scleral design can fit every patient, so it is great to see new unique designs
being developed.
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Contact Lenses for Color Deficiency
A few weeks ago I wrote about one little known therapeutic
application of tinted contact lenses for photosensitive epilepsy patients, which
spurred some questions: what about tinted contact lenses for color deficiency?
The concept of assisting color perception in color deficient individuals with tinted
contact lenses is not new, as it was first proposed in 1837. One of the historically
most widely used lenses was the X-Chrom lens, a red-tinted (historically rigid)
contact lens, typically worn in the non-dominant eye.1 Dating back to
1974, studies have shown that in systems where a red or magenta lens is fit on the
non-dominant eye, performance on pseudoisochromatic plate testing can almost instantly
be improved.2
More recent literature on this topic comes from Swarbrick and colleagues3
who studied the ChromaGen system in 14 color deficient patients in which all were
fit with either a pink or magenta tint in the non-dominant eye (plus often a different
colored lens in the dominant eye). They found that the tinted lenses significantly
reduced Ishihara error rates and subjectively, patients reported enhanced color
perception. They concluded that such tinted lenses can indeed enhance subjective
color experience and assist in certain color-related tasks. However, they caution
that color vision is not normalized with use of tinted lenses and this form of correction
is not indicated as a treatment for color deficiency in occupations with color vision-related
restrictions.
More about this in the December issue of Contact Lens Spectrum.
1. Zeltzer, H. The X-Chrom lens. J. Am. Optom.
Assoc. 1971; 42, 933±939.
2. La Bissoniere, PE. The X-Chrom lens. Int. Contact Lens Clin. 1974; 1
(4), 48±55.
3. Swarbrick HA, Nguyen P, Nguyen T, Pham p. The ChromaGen contact lens system:
colour vision test results and subjective responses. Ophthalmic Physiol Opt.
2001 May;21(3):182-96.
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Effect of CL
Materials on Disinfection Activity of Polyquaternium-1 and Myristamidopropyl Dimethylamine
MPS Against Staphylococcus Aureus
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This study examined the interaction of seven different
lens materials with a multipurpose solution (MPS) containing the disinfectants polyquaternium-1
(0.001%) and myristamidopropyl dimethylamine (0.0005%). The objective of this study
was to determine whether the different lens materials affect the concentration of
a disinfectant in this commercially available MPS and the efficacy of the disinfectant
against Staphylococcus aureus.
Silicone hydrogel lenses (galyfilcon A, senofilcon A, comfilcon A, enfilcon A, balafilcon
A, and lotrafilcon B) and a conventional hydrogel lens (etafilcon A) were soaked
in polypropylene lens cases filled with commercially available MPS containing 0.001%
polyquaternium-1 and 0.0005% myristamidopropyl dimethylamine for 6, 12, 24, 72,
and 168 hours. Empty lens cases were also filled with MPS. After each time point,
solutions from cases containing the seven types of lenses and controls were assayed
for activity against S. aureus according to International Standards Organization
14729 standard with modifications. Test solutions were analyzed for polyquaternium-1
and myristamidopropyl dimethylamine concentration at each time point.
The concentration of polyquaternium-1 and myristamidopropyl dimethylamine remaining
in the lens cases was reduced only slightly over time. Storage with the lenses did
not adversely affect biocidal efficacy of the solution, and in some cases, it was
significantly better (P=0.0029).
The efficacy of this polyquaternium-1 and myristamidopropyl dimethylamine MPS to
kill S. aureus was not adversely affected by the presence of lens materials
soaking in the cases. Thus, current methods for performing solution antimicrobial
testing should be reevaluated.
Shoff ME, Lucas AD, Phillips KS, Brown JN, Hitchins
VM, Eydelman MB. The Effect of Contact Lens Materials on Disinfection Activity of
Polyquaternium-1 and Myristamidopropyl Dimethylamine Multipurpose Solution Against
Staphylococcus aureus. Eye Contact Lens. 2012 Nov;38(6):374-8.
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A Proud Supporter of
Important Links:
To report adverse contact lens reactions visit:
http://www.accessdata.fda.gov/scripts/medwatch/ or call (800) FDA-1088.
To report possible grievances related to the Fairness to Contact Lens Consumers
Act or associated Contact Lens Rule visit:
https://www.ftccomplaintassistant.gov/.
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For more information on Contact Lenses Today including archives of previous
issues, please visit our website at www.cltoday.com.
For the latest articles on contact lenses, important clinical information and helpful
tools related to the contact lens practice visit the Contact Lens Spectrum
website at www.clspectrum.com.
© 2012 All Rights Reserved Contact Lenses Today and CLToday
are registered trademarks of:
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