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Autorefractors


 

 

2 Win Hand Held Autorefractor
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Click here for Explanation of Aberration and Wavefront

 

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HUVITZ HRK-8000A

Unlike many conventional diagnostic devices, HRK-8000A is based on Hartmann-Shack wavefront sensor, which analyzes many focal spots of a light wavefront.

It has the ability to measure not just the basic refraction error of a customer, but to obtain a spatially resolved refraction map.

The new HRK-8000A utilizes a unique wavefront analysis algorithm and surpasses conventional and simple refraction offering added values with high order aberration data output for customized lenses and observation of patients before and after refractive surgery.

Experience the whole new wavefront Auto Ref-Keratometer form Huvitz, HRK-8000A!

Which is better "1 or 2"

This familiar phase has been used for over a century when conducting a subjective eye exam. Subjective eye exam using the outdated Which is Better The subjective exam is conducted by placing lenses of varying power in front of the patient's eyes and asking the patient to subjectively identify the lens that provides the best vision, lens "1 or 2". The same subjective method has been used for decades without any significant advances in the testing procedure. Although ophthalmic physicians are experts in the art of subjective refraction this method often leaves the patient confused on what response to provide. This can even result in the patient's final Rx not providing the best visual correction.

 

TestingWomen



Pictured Above: Subjective eye exam using the outdated Which is Better "1 or 2" methodology

It is now possible to eliminate most of the confusion of the "1 or 2" eye exam.

Huvitz HRK-7000AW WaveFront Aberrometer Advances in technology over the past decade have brought significant improvements that allow the subjective eye exam to be revolutionized. One advancement involves the use of the Huvitz WaveFront Aberometer. Similar in design to an autorefractor, it uses a wavefront of light to objectively measure the overall refractive power error of the eye. This is done by by mapping how light rays travel through the eye and by providing maps using color gradients to represent magnitudes of the refractive errors, which enables ophthalmic phycisian to locate and possibly correct even obscure imperfections that cause vision defects.

Huvits

Pictured Above: Huvitz HRK-7000AW WaveFront Aberrometer

High and low order optical aberrations

Conventional subjective eye exams measure low order (2nd order) optical aberration?sphere, cylinder and axis and, in the case of a presbyope, the addition power. Through advancements in LASIK surgery, wavefront aberrometry was developed to optimize the visual outcome. Huvitz Wavefront Aberrometry is an advanced 21st century optical measuring technology that measures high order aberrations within the human eye, called Zernike coefficients. Only one of these levels - 2nd order aberrations - are measured in conventional subjective refractions today. An aberrometer is capable of taking advanced, objective and complex optical measurements of the human eye in seconds, compared to the typical 15 minute subjective eye exam.

Optical aberrations are defined as anything that causes light to bend and can change significantly as the pupil dilates under low light conditions, such as at night. This is why many people are happy with their vision during daylight hours and then are uncomfortable and complain about their vision at night. The important optical aberrations that affect vision are:
Zproduct


The figure above shows Zernike radial orders n=0 through n=5. Each radial point is called a Zernike polynomial. Every eye, just like your fingerprint has a unique set of Zernike Zernike radial orders n=0 through n= 5polynomials known as the "optical fingerprint" of the eye. Only 2nd order polynomials are currently measured in an eye exam.

2nd Order optical aberrations - currently measured in all eye exams providing sphere, cylinder and axis corrections.

3rd and 4th Order optical aberrations - high order aberrations currently not measured in today's eye exams but can account for up to 20% of the eye's refractive error.

5th and 6th Order optical aberrations - also high order aberrations not currently measured in today's eye exam. These aberrations are of less significance clinically, however they manifest in reduced vision for a small percentage of eyes.

Uncorrected high order aberrations (HOA's) can lead to poor nighttime vision, a reduction in depth of focus for reading, glare around lights at night and reduced color perception. All of these HOA's manifest in varying degrees for each individual patient. Pupil size is a significant contributor to the manifestation of high order aberrations. As the pupil increases in size, more peripheral light enters the eye. As a result, a blur circle is created instead of a point focus on the retina. As the blur circle increases in size and shape, visual clarity is diminished. This is why even some patients with 20/20 vision can complain of visual discomfort.

Wavefront

The WaveForm printout show potential improvement to visual acuity with the higher order aberrations corrected.

Wavefront aberrometery has been commercially available for over 10 years. Its primary use, when originally introduced into the optical industry, was to provide optical measurements that could aid the refractive surgeon improve the vision outcome for LASIK. The aberrometer shines a perfectly shaped wave of light into the eye and captures reflections distorted based on the eye's surface contours. Thus, it generates a map of the optical system of the eye, which can be used to prescribe a solution, correcting the patient's specific vision problem. Manifestation of uncorrected high order aberrations on patients with 20/20 vision.

EEEs

The figure above demonstrates the manifestation of uncorrected high order aberrations on patients with 20/20 vision.

This technology has greatly improved optometrists and ophthalmologists' ability to develop more precise and specific prescriptions. By using the Huvitz Wavefront Aberrometer, it is possible for many patients achieve a much higher standard of vision.

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