Contact lenses for Keratoconus

Luckily for us, there is a wide choice of contact lenses available for those with keratoconus. Fitting contact lenses on a keratoconic cornea is challenging and time-consuming. You can expect plenty of return visits to fine-tune the fit and the prescription, especially if the keratoconus continues to progress. It’s very unlikely that any lens will fit first time, so patience and perseverance is key.

Here’s a guide to what’s on offer, so you can ask your contact lens fitter what they can offer you:

Custom soft contact lenses

Recently, contact lens manufacturers have introduced custom soft contact lenses specially designed to correct mild-to-moderate keratoconus. These lenses are made-to-order based on detailed measurements of the keratoconic eye(s) and can be more comfortable than gas permeable (GP) or hybrid contact lenses for some wearers.

KeraSoft by Bausch & Lomb lenses can correct up to -30 diopters (D) of myopia and up to -15 D of astigmatism and are available in silicone hydrogel and regular hydrogel materials with high water content (74 to 77 percent). Kerasoft lens are great for early stage Keratoconus and also post graft eyes. KeraSoft IC lenses are designed to fit irregular corneas, including keratoconus, post laser refractive surgery, pellucid marginal degeneration, and other corneal irregularities. Each KeraSoft IC lens is custom-made for your exact needs, and KeraSoft IC lenses can offer increased wear time and improved comfort and are a patented combination of the latest technologies in silicone hydrogel materials using geometries from complex mathematics to offer comfortable wear and excellent vision.

NovaKone lenses (Alden Optical) can correct up to -30 D of myopia and up to -10 D of astigmatism and are available in a hydrogel material with medium water content (54 percent).

Both lenses have a very wide range of fitting parameters for a customized fit and are larger in diameter than regular soft lenses for greater stability on a keratoconic eye.

In a recent study of the visual performance of toric soft contacts and rigid gas permeable lenses for the correction of mild keratoconus, though GP lenses provided better visual acuity in low-contrast situations, soft toric lenses performed equally well in high-contrast acuity testing.

Custom soft toric lenses also can be a good option for part-time wear for people with keratoconus who cannot tolerate wearing gas permeable lenses full-time.

Custom toric soft contacts for keratoconus are significantly more expensive than regular soft contacts

Hybrid contact lenses

Synergeyes hybrid lens

ClearKone® hybrid contact lenses offer all the benefits of rigid gas permeable (RGP) and soft contact lenses without any of the disadvantages for an overall good contact lens experience.

ClearKone® is an NHS approved and FDA-cleared hybrid contact lens specifically designed for the treatment of keratoconus and other corneal irregularities. Using a revolutionary technology, ClearKone® combines the best of both worlds – the crisp vision of a high-oxygen rigid RGP contact lens with the all-day comfort and convenience of a soft lens.

ClearKone® is specifically designed to restore vision to patients with the many types and stages of keratoconus, including post graft lens wear. Because the ClearKone® lens vaults over the cornea, there’s minimal risk of corneal scarring, making ClearKone® hybrid contact lenses a healthy treatment option for keratoconus. In addition, the soft skirt of the ClearKone® design helps to center the contact lens over the visual axis regardless of where the cone is located on the cornea or how large it is, thereby decreasing visual distortions and providing superior vision. The ClearKone® design also prevents dirt from getting under the lens and will not pop out unexpectedly.
Hybrids use soft lens cleaning solutions.

 

Ultrahealth hybrid lenses

UltraHealth, available in 2013, from Synergeyes,  is the only irregular cornea hybrid contact lens with highly breathable, healthy materials and an advanced lens design especially suited for patients with irregular cornea conditions. UltraHealth corrects vision problems, is healthy for your eyes and delivers exceptional comfort, too.

UltraHealth delivers vision benefits only available in hybrid contact lenses. The “rigid” (GP) material optimizes vision; while the soft skirt centers the lens over the cornea, providing enhanced stability and clarity. The soft silicone hydrogel material that surrounds the GP portion of the lens provides longer-lasting comfort for irregular cornea and keratoconus patients. UltraHealth is made with materials that allow very high oxygen transmission. The lens design also promotes tear circulation throughout the day, which delivers even more oxygen to the eye.

Ideal for Patients with:

  • Irregular cornea
  • Keratoconus
  • Ectasia
  • Intacs®
  • Post-Surgical

Eyebrids

The launch in France of the first range of Hybrid Contact Lenses, combining quality of vision with rigid lens wearing comfort soft lens was announced by the French laboratory LCS (Contact Lens Service) in early 2013. The new patented range of lenses named EyeBrid is the result of four years of research by teams at LCS. These innovative lenses need renewal every 4 months but also offer a high oxygen permeability (Dk strong). This new lens is as comfortable as a soft lens and offers the visual quality of a hard lens.

Gas permeable contact lenses or RGP

By far the most widely used contact lens for keratoconus, with the most popular RGP being the RoseK. it is essential RGP lens are fitted by an expert.
If eyeglasses or soft contact lenses cannot control keratoconus, then rigid gas permeable (RGP or GP) contact lenses are usually the preferred treatment. Their rigid lens material enables GP lenses to vault over the cornea, replacing its irregular shape with a smooth, uniform refracting surface to improve vision.

Rose K was established to market the Rose K lens invented by Paul Rose, an optometrist from Hamilton, New Zealand.  Paul was concerned about what could be done for patients with keratoconus – a progressive condition in which the surface of the cornea becomes cone shaped.  Realising that the problem with traditional contact lenses was that they did not fit unusual corneal shapes or mimic the eye shape well, he sought to develop a contact lens that would be more comfortable for patients, be easier to fit and provide better vision to those with the condition. Paul Rose began developing the Rose K keratoconus lens in 1989.  After testing 700 lenses and 12 different designs, he produced a set of 26 lenses from which all patients are fitted.  A further two years was spent to perfect the lens design before it was launched in the New Zealand market.  In 1995, the Rose K lens gained approval from the Federal Drug Administration (FDA) of America.

Since then advances in technology have resulted in the introduction of the Rose K2 lens, the Rose K2 Irregular Cornea (IC) lens and the Rose K2 Post Graft lens designed for patients with specific conditions.  These conditions include Pellucid Marginal Degeneration, Keratoglobus, Lasik Induced Ectasia and for patients who have undergone Penetrating Keratoplasty.

The Rose K family of lenses are now manufactured in 13 countries, distributed in over 60 countries and have become the most frequently prescribed lenses for keratoconus in the world. RGP contact lenses can be less comfortable to wear than soft contacts, and really need expert fitting and patience. Looked after they are durable and cost effective.

“Piggybacking” contact lenses.

Because fitting a gas permeable contact lens over a cone-shaped cornea can sometimes be uncomfortable for a person with keratoconus, some eye care practitioners advocate “piggybacking” two different types of contact lenses on the same eye.

For keratoconus, this method involves placing a soft contact lens, such as one made of silicone hydrogel, over the eye and then fitting a GP lens over the soft lens. This approach increases wearer comfort because the soft lens acts like a cushioning pad under the rigid GP lens.

Your eye care practitioner will monitor closely the fitting of “piggyback” contact lenses to make sure enough oxygen reaches the surface of your eye, which can be a problem when two lenses are worn on the same eye. However, most modern contacts — both RGP and soft — typically have adequate oxygen permeability for a safe “piggyback” fit.

Scleral or ‘sceral’ lens (spelling)

Many optometrists and ophthalmologists recommend scleral contact lenses for a variety of hard-to-fit eyes, including eyes with keratoconus. The first scleral lenses were made in glass, blown and fashioned into shape by craftsmen in the 1880’s. They were also the only lens available up until the 1950s.

In cases of early keratoconus, a standard RGP lens can be used. However, if the lens does not centre properly on the eye, moves excessively with blinks and causes discomfort, switching to a large-diameter scleral contact lens may solve the problem. Scleral lenses were made in rigid gas permeable (RGP) materials in 1983, and today are highly oxygen permeable.

Scleral lens are designed to vault the corneal surface and rest on the less sensitive surface of the sclera, so these lenses often are more comfy for a person with keratoconus. Scleral lenses are designed to fit with little or no lens movement making them more stable on the eye, compared with traditional corneal gas permeable RGP lenses.
The newest scleral lens is the ICD 16.5. With only three fitting zones, ICD™ 16.5 is easy to evaluate, consistent in lens performance and is the “go-to” lens for problematic corneas.

Scleral Lenses for Other Eye Problems

In addition to keratoconus, scleral lenses can be used for eyes that have undergone a cornea transplant, and for people with severe dry eyes caused by conditions such as Sjogren’s syndrome, graft-versus-host disease (GVHD) and Stevens-Johnson syndrome.

Large-Diameter Contact Lenses
LENS DIAMETER* CLASSIFICATION EXAMPLES
12.9 to 13.5 mm Corneal-scleral SoClear (gt_eq13 mm; Art Optical, Dakota Sciences)
13.6 to 14.9 mm Semi-scleral Tru Scleral (gt_eq13.5 mm; Tru-Form Optics)
Perimeter (14 or 14.8 mm; Abba Optical)
Dyna Semi-Scleral (gt_eq13.5 mm; Dyna Lenses)
14.5 mm Hybrid
(RGP center with a silicone
hydrogel skirt that rests on
the sclera)
ClearKone – for keratoconus
Duette – indicated for use in healthy eyes, up to ±20 D
sphere, astigmatism of lt_eq –6 D
Duette Multifocal – indicated for healthy presbyopic
eyes (all hybrid examples, 14.5 mm; SynergEyes)
15 to 18 mm Mini-scleral Jupiter† (15 or 18 mm; Visionary Optics, Abba Optical)
Maxim (16 mm; Accu-Lens)
18.1 to 24 mm Scleral Jupiter† (18.8 or 22 mm; Abba)

*Upper and lower boundaries are approximate; sizing and terminology vary among lens makers.
†Manufacturers of RGP materials with FDA-approved lens designs provide the raw material to multiple labs, which produce the lenses under their own brand.

http://www.aao.org/aao/publications/eyenet/201201/feature.cfm?RenderForPrint=1

Lens care

Contact lens case

Whatever lens you wear It is important to clean your contact lenses daily to maintain the highest standards of comfort and visual clarity. Each day after you remove your lenses, you must clean them prior to overnight storage.
Always use the correct solution, never use tap water. Change your contact lens case regularly as bacteria will happily live in the little damp case, that could damage your eyes and cause infections.

Try not to overwear your lens especially in the early days of getting used to them. If they hurt – take them out and clean them, and let your eyes rest. Try to avoid aircon and get fresh air to your eyes when you can. There are various rewetting and comfort drops available from pharmacies and your doctor. Always check that they’re suitable to use with your type of contact lens.

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DALK + INTACS

What is Keratoconus?

Originally posted on I Hate These Blurred Lines:

Before I start with the righteous posting about my journey, self worth and all the other nonsense, it’s probably best to start explaining what the condition is. Firstly, Keratoconus does not mean I’m going to transform into this:

kerry katona celebrity big brotherKerry Katona, not Keratoconus

Keratoconus is a disorder which affects the surface of the eye (cornea) which causes it to thin out and form a cone-like shape as opposed to the normal, curved surface. Effectively, it turns the front of my eye into something like this:

Keratoconus.svgEffect of Keratoconus on the surface of the eye

It doesn’t seem like much of a big deal. So I’ve got slightly pointy eyes. Spock had slightly pointy ears, but it seemed to work out ok for him, right? Unfortunately not. The cone-shaped curvature and rough surface (sadly it does not thin out evenly across the cornea) means that the light that enters the eye is…

View original 384 more words

Playing the Waiting Game

Originally posted on I Hate These Blurred Lines:

So at the end of the last post I was now waiting a year to see how the keratoconus was progressing. At the time, the consultant in the hospital also said that if I experienced any discomfort or troubles to get back in touch and make another appointment. That was May 2012.

My son was born in June 2012. This is quite an important event for more than the obvious reason. As the year progressed, I started to struggle more and more with my eyesight, even with the new prescription that I got in my initial opticians appointment. At first, I put this down to being a new father.

can-t-sleep-meme-generator-uum-am-i-asleep-yet-46ef96

But then fortunately for myself and my wife, our son developed a liking for sleep after just a few months and our own sleep began to return. The struggles with the eyesight did not disappear. In late October, a long late…

View original 452 more words

CXL – The Procedure

Originally posted on I Hate These Blurred Lines:

As I mentioned in the What Is Keratoconus page, keratoconus (KC) is an eye condition where the structure of the cornea distorts, thins out and becomes cone-shaped. One of the more recent and successful treatments in halting the progression of KC is corneal collagen cross-linking (CXL). The following video is a pretty good in describing, and then showing, the procedure itself. If you want to skip to the uncomfortable cutting bits and avoid the boring words, it’s from 1.00 onwards.

This technique is designed to ‘fix’ the collagen in the cornea in place so that progression is halted. It does that by reacting the collagen with riboflavin in order to cross link the polymer structure and make it more rigid.

Danger! Ahead be Chemistry!

The mechanism of this reaction was investigated in 2010 by McCall et al. who looked at a variety of pathways and elucidated which one was the…

View original 324 more words

Corneal Collagen Cross Linking (CXL)

Originally posted on I Hate These Blurred Lines:

Continuing the story, I had been referred to East Grinstead’s Queen Victoria Hospital for corneal collagen cross linking (CXL) in my left eye. I’m going to split this up into two parts – the what happened (this one) and the science bit (the other one). Just so that if you’re not interested in the science behind the procedure, or watching the procedure itself, you can ignore that part!

East Grinstead is a bit of a pain to get to. It’s either a trek around the M25 in the car or a cross-London (and subsequently ridiculously priced) train journey. However if you know when you’re going, you can get the train fare down by booking online and I managed to get most journeys to QVH down to £25.

My first appointment with the doctors there was remarkably pleasant. They appeared knowledgeable, far more so than those at…

View original 700 more words

My Point Of View

Originally posted on A Quest For Happiness:

kc_blurred_visionThe photo to the left is how I see the world with Keratoconus, even with my high prescription glasses. Well, this how I see with my right eye (the good one), my left eye is even worse. This makes my life a lot difficult at times. u_u

I can’t read a real book anymore, which was something that I loved to do once upon a time. I have a Kindle for reading, as I can adjust the font to “grandma” size, however it’s not the same as turning the actual pages and smelling the fresh ink of a hard copy book. I get bored with my Kindle, with half of the fun experience of reading stripped away, and haven’t finished a book in a few years now.

Writing emails, blogs, and novels take effort for me to do. I can’t spend as many hours doing so, as my eyes will…

View original 830 more words

CROSSLINKING – DAY 1!

Originally posted on Avarielle's Keratoconus blog:

So I woke up around 7+ this morning and lazed around. I played Skyrim to kill time. Then went to order McDonalds breakfast delivery to eat – and processed a photo while i ate. After that, it was almost time to go.

(The eye centre had called the day before and said that I had to be there by 11am)

Took a nice long shower and scrubbed the life out from my hair, since I didn’t know when I would next get to wash my hair.

Then it was off to the eye centre. Along the way, I laughed like crazy at every thing.

Observe: we were driving behind a Ferrari and the mother asked why was there a horse brand car. I literally laughed till I cried at it.

Anyway we got to the eye centre and just waited and waited.

Then i went into have my eyes tested…

View original 518 more words

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