What are High Order Aberrations (HOA)

The eye has optical imperfections that cannot be measured by conventional means and are not correctable with today's lenses. These are called HAO.

Irregular astigmatism: A curvature irregularity that cannot be measured or corrected using conventional testing methods

50% of the population has HOA that produce a noticeable reduction in vision.

15% would achieve major benefit from having their HOA corrected

Higher order aberrations make up approximately 20% of total optical error.

It is estimated that over 40% of contact lens wearing patients have some degree of uncorrected astigmatism

Virtually every patient can experience an improvement in vision due to uncorrected and undetected aberrations that exist within their eyes.

Signs of Non-Optimized Vision

optimised vision	typical aberration glare

• Double images

• Low contrast, lack of crispness

• Lack of colour perception

• Glare sensitivity

• Night driving problems

• “Halos,” “starburst patterns,” “comet’s tails” around lights at night

• Compromised far and near vision

Until recently we ignored HOA

• No way to measure them

• No practical way to correct them

Why all the attention now?

• New instrumentation can measure HOA

• Used in astronomy to subtract out optical aberrations seen through space telescopes
   
• Technology now adapted to other optical lenses and the human eye
   
• The Z-View Aberrometer won the Medical Design Award 2005

How does wavefront work?

A perfectly shaped wave of light is shined into the eye.

A distorted beam of light reflects out of the eye.

The wavefront sensor measures the distortions and records them in a refractive map of the eye (the complete visual system)

Aspheric Contact Lens Correction

• “First Generation” aspheric front surface daily contact lenses are called "NEWDAY" by Sauflon

•  A constant aspheric front surface is combined with a changing power curve

  • Can provide improved contrast sensitivity
     
  • Can help for small amounts of astigmatism 0.25-0.50D

  Patented Aberration Control Technology

   

• "Second Generation" - aspheric front surfaces designed through Wavefront Research

• Wavefront aberrometry readings were taken on many patients.

• These results yield the development of an average aberration curve for each power.

• From this research, specific algorithms are developed across the entire power range.

• These “individualized” aspheric front surfaces are then combined with the appropriate power curve.

• Instead of a single aspheric curve “married” to a changing power curve, the ideal aspheric curvature is incorporated for each soft lens power.

• The design also compensates for aberrations caused by lens flexure on the eye.
   

How do Wavefront daily contact lenses work?

The wavefront algorithms are used in a computer-controlled ContinuFlow™ molding system to a nano-meter level of manufacturing accuracy. 

This results in a contact lens with a front ellipsoidal surface that reduces high-order aberrations as well as correcting low-order aberrations. 

Aberration Control Contact Lens have a thin draping edge design with low tangential edge lift. This thin peripheral curve design reduces lid interaction and lens awareness for extreme comfort.



 

The Benefits of Aberration Control Wavefront Technology

• Enhanced contrast sensitivity

• Crisper, clearer vision
   

• Improved Night Driving Vision
   

• Improved visual acuity, especially in moderate to high prescriptions

• Astigmatic correction up to 1.00D

• Better print contrast for low-level presbyopia

• Can provide improved depth of vision
   

Designed in San Jose, California by OCI

• Patented technology for aberration control has led to the introduction of A NEW Type Of Daily Disposable Contact Lenses developed using Wavefront Guided Optical Aberration Control Technology
   

Unlike any other soft aspheric disposable lens in the market today.

Incorporates the ideal aspheric curvature for each soft lens power and compensates for aberrations.