contact lens management
An Improved Rose K
Keratoconus
patients get a new contact lens option.
FAYE
PETERS, O.D.
Blanchard
Contact Lens' Rose K2 Aberration Control contact lenses have helped me conquer some
of the challenges of keratoconus fittings. Many of our patients are referred to
us due to failed contact lens wear and are searching for improved vision and comfort.
The improved lens design helps me provide the keratoconus patient better overall
visual acuity, improved night vision and improved comfort over the original Rose
K and other keratoconus lens designs.
Precise fitting
These lenses feature the company's proprietary
Systematic Approach to Fitting to guide you through the step-by-step process. The
initial step in fitting these lenses is to define the appropriate apical touch (base
curve selection), then assess the edge lift pattern. If a change in edge lift is
dictated relative to the diagnostic lens edge lift flourescein pattern, you define
whether the edge needs to be flatter or steeper relative to the Systematic Approach.
If the fit requires a change in edge lift, the Systematic Approach compensates for
the peripheral and intermediate curves, base curve and lens power based upon the
change indicated at the lens edge. Thus you can maintain the proper apical touch
indicated by the initial base curve selection. This fitting approach minimizes the
number of successive lenses necessary to reach the final lens parameters. The company
provides a desk-top, computer fitting calculator to automate the fit process with
a step-by-step analysis of base curve and edge lift selection. This approach guides
you in fitting the advanced keratoconus patient, as well as converting those wearing
the original Rose K lenses to the new Aberration Control lenses.
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The
Rose K2 LENS POWERS:
Any
DIAMETERS:
7.9mm - 10.2mm
BASE CURVES: 4.75mm and -8.4mm
MATERIAL: Standard: Boston XO, available
in any on request
PRICE: $90.00 per lens warranted.
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It's all in the base curve
A posterior, aspheric, conic section replaces
the spherical, posterior optical zone of the original Rose K lens. This aspheric,
conic section is composed of the posterior optical zone and the first two fitting
curves paracentral to the posterior optical zone found on the original Rose K. The
larger posterior, aspheric, conic section of the optical zone minimizes on-axis
aberration created by high minus power and steep base curves, prevalent in keratoconus
lens prescriptions. The lens creates a smaller blur circle image on the retina than
the original Rose K. This reduces spherical aberration and improves contrast while
reducing flare, glare and halo in dim illumination. Company studies indicate patients
may see up to two lines of improvement in visual acuity with power above -10.00D,
a result I've duplicated with my keratoconus patients.
Upgrading is easy
I've
found that if your patients are wearing Rose K lenses already, you can easily switch
them into the new design. You need only specify that you want the new lens when
ordering and provide the existing lens parameters. You can achieve new patient fittings
using the original fitting set. Apply the same proprietary fitting method. It's
my experience that this lens is an excellent option for keratoconus patients, providing
the majority of them with improved visual acuity, better contrast and longer hours
of comfortable wear.
DR. PETERS PRACTICES AT PRICE
VISION GROUP IN INDIANAPOLIS. E-MAIL HER AT
FAYEPETERS@PRICEVISIONGROUP.NET.
Optometric Management, Issue: July 2006