Awaya Aniseikonia Test Book                                                               View Shopping Cart

SUMMARY:

Aniseikonia can result from natural anisometropias or as an increasingly common surgically iatrogenic complication. The detection and diagnosis of the aniseikonic condition is becoming increasingly important due to the proliferation of LASIK and other mono-vision ophthalmic surgeries. These surgeries can seriously affect binocular vision and can cause a variety of symptoms, from double vision to loss of depth perception, discomfort and pain (called asthenopia). The new Awaya test for Aniseikonia provides an easily administered and repeatable method to test for this condition.

GROWING IMPORTANCE OF ANISEIKONIA

In addition to the intentional creation of monovision cases, the risk of monovision can occur accidentally as part of the newest Ophthalmic surgeries such as LASIK, PRK and Pseudophakia even when monovision is not the intended result. Some reports show as much as 41% of post- pseudophakic patients have symptoms attributable to Aniseikonia.

Dr Marshall Parks, former President of the American Academy of Ophthalmology and an authority on binocular vision addressed the iatrogenic monofixation syndrome cases he has seen in his von Noorden lecture in September 1999 saying: "…to risk converting the normal 95% of the presbyopic patients to monofixation Syndrome (i.e. loss of binocular vision) is the issue to address today." He stated that there are risks from this conversion to monovision which may not be reversible or treatable. In response to the growing reports of complications resulting from LASIK, some clinics in Europe have reported using the Awaya Aniseikonia test as a pre-screener prior to LASIK surgery in order screen for any serious Aniseikonia condition (over 5%) to increase the LASIK satisfaction rate.

Some patients have a condition called "MERIDIONAL Aniseikonia". This would be detected as normal or have less Aniseikonia in one direction and a lot or more in another direction. This is usually due to a large ASTIGMATISM, which is found on refraction of the patient. That just means that a different strength of lens at different angles is needed. Refraction will show the astigmatism has a definite angle to it, and the Aniseikonia test should then be administered at that angle and also at right angles to that angle to determine the amount of meridional Aniseikonia that is present.

HOW THE TEST WORKS:

The new Awaya test for Aniseikonia developed by Dr Awaya of Japan, is very easy to administer and interpret. The test uses a very clever direct comparative approach with the patient viewing pairs of adjacent calibrated half-moon targets - one red and one green. Red/Green Anaglyph technology separates the right and left eye images for comparison. Targets are presented in one percent increments from 0 to 24%. A second set of targets is then presented for verification of the results. While the aniseikonic condition can be present on any radian, the test should at least be administered on the vertical and horizontal axis. Tilting the head does not invalidate the test.

        

1378R     Aniseikonia Test Book .................................................................... $220.00 Add To Cart
(24 figures, one 0 Equal Size figure, instructions and red/green glasses)

13789R   Aniseikonia & Cyclodeviation Book Set With Glasses .......... $380.00 Add To Cart

Technical Articles

Maddox Vs Awaya Cyclodeviation Test

Management of Aniseikonia

Aniseikonia Technical Bulletin (pdf)

Aniseikonia and Cyclodeviation Index

 

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