Truths about Keratoconus and Cross Linking

I am amazed when docs claim that they have invented a procedure even though it existed for years before. For example a surgeon claiming they invented cornea cross linking even though it was being performed in Europe for many years.

What gets me peeved is that some doctors use unproven technology and convince patients its the best. Snake oil sellers are an amusement till patients are harmed. So i decided to list some truths about keratoconous eye disease and cornea collagen cross linking.

The 10 Golden Truths about Cornea Cross Linking By Rajesh Khanna, MD a Keratoconus specialist.

  1. Keratoconus is a sight threatening disease.It involves thinning and bulging of the cornea.
  2. Recent data suggests it may be more prevalent than 1 in 2000
  3. Cornea Collagen Cross Linking (CXL) is proven and effective to halt the progression of progressive keratoconus eye disease.
  4. CXL may used to stabilize post lasik ectasia.
  5. Epithelium off Cornea cross linking is more effective than epi on cross linking.
  6. Conventional cornea cross linking – 3 mw for 30 minutes is the gold standard.
  7. Conventional  cross linking is more effective than accelerated cross linking (18 mw or 30 mw). No other power setting is better.
  8. No studies have shown epi on cross linking to be more effective than conventional api off cross linking.
  9. FDA has only approved Avedro KXL system/Photrexa for treatment of progressive keratoconus. No other system nor riboflavin compound has passed that litmus test.
  10. Avedro KXL/ Photrexa which treats at 3mw is currently safer and more effective than currently available api on choices in Los Angeles

I would invite comments by optometrists, ophthalmologists and peers especially keratoeonus experts.

Avedro KXL system in the hands of an experienced Keratoconus surgeon following FDA protocols would be safer than an unproven experimental api on technology.We therefore offer Avedro cornea collagen cross linking with FDA approved protocol.

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Pupil Tracking in Cornea cross linking for Keratoconus.

We have been talking about the advantages of epithelium off cross linking. This from of cross linking has shown to work in numerous studies across the world.

But are all delivery methods the same? Certain machines hope the patient keeps looking at the UV light.  Have you tried staring at something for 30 minutes. As a kid you may have played the stare off game. Its tough to do it especially in Los Angeles with the dry weather.

The solution in this fight against keratoconus is to involve a pupil tracker. In the above video you will see it in action. If the eye moves away form the light the UV delivery and the timer will stop. You  can set how much movement you are willing to allow.

This increase the safety. One can definitely know that 30 minutes were delivered. It can avoid a situation where a fidgity patients moves and receives  only 20 minutes of the radiation. Increasing safety also relaxes the patients. Most of people requiring this intervention against Keratoconus eye disease are teenagers. Pupil tracking rocks.

Epi on or Epi off Crosslinking- that is the question

Keratoconus progression can be halted by corneal collagen cross linking has been established. We thank all our patients who believed and participated in the trials. Now the hot question is which is better- to remove epithelium or to leave it alone.The debate has recently become intense. Various specialists have filed trade marks, patents or invested in a particular technology. Sometimes their opinions seem biased. So where do we turn to if we want to know the true answer?

Riboflavin cornea cross linking
How about the FDA? They are experts at looking at the data and known for they unbiased opinion. They have the interest of American patients in mind.

They analyzed lot of safety data. Here is what they have approved in USA 

Epi off cornea cross linking 

So that means so far Epi off is better than epi on or it’s variations like c3R

The epithelium interferes in the seepage of riboflavin i the cornea. It also hinders the uniform transmission of uvA . Therefore it a good idea to remove it

Some may disagree and say FDA process is tedious and hence Epi on is still stuck somewhere. We can than turn to peer reviewed journals. No published study has ever shown that Epi on crosslinking is better than Epi off.

Multiple studies have shown that Epi on Cross linking is the current Gold Stsndard.

So we rest our case

Epi off cross linking is the procedure Keratoconus specialists recommend 

FDA approves epi off Cornea cross linking

Yes what we had been waiting for finally happened. Another arrow in fight against keratoconus . FDA looked at the safety and efficacy of riboflavin activated by uv A radiation in detail. They looked at the data submitted by Avedro. FDA said epithelium removed or epi off is a good option. 

This means if you have been waiting to make your cornea stronger the time has arrived. It may also mean your insurance may cover part of the cost. So send your insurance card to our keratoconus center. You may also qualify for no interest 36 monthly payment plan.

Unfortunately they have not approved epi on or c3r and other variants. So invest your money in the technique FDA considers more safe and result oriented. 

Come to our Beverley Hills center for keratoconus treatment and get an unbiased opinion.

Posterior-corneal-elevation-detection

In this study done in Ibaraki, Japan, keratoconus and cornea researchers wanted to see whether  three-dimensional (3D) corneal and anterior segment optical coherence tomography (CAS-OCT) or  a rotating Scheimpflug camera combined with a Placido topography system (Scheimpflug camera with topography) was better to study the cornea. They wanted to see how it would be best to detect the signs of early keratoconus disease. Their goal was to asses if  normal eyes and forme fruste keratoconus could be separated based on that criteria. They found out that both systems worked equally good. Our own Los Angeles Keratoconus Expert feels an early cornea topography works equally good in the hands of an experienced keratoconus expert.

Sex and keratoconus

RESULTS: The women were older, more likely to report a family history of keratoconus, more likely to be nonwhite, and less likely to complete college than men. Vogt’s striae and monocular and binocular high-contrast entrance acuity were the only visual characteristics that varied between men and women in the multivariate model. Women were more likely than men to report ocular symptoms of dryness and complaints based upon a composite score of ocular symptoms. Women reported more hours per day of near work and were less likely to report the ability to wear contact lenses for enough hours to permit reading at home in the evening. Women reported more visits to their eye care practitioner during the previous 12 months. NEI-VFQ results revealed differences in self-reported difficulty with distance activities and driving.