Bernell Red/Green Eccentric Circles

Paired cards are useful in positive & negative fusional range development.

The Bernell free space red/green eccentric circles have several improvements over the traditional version. As with other eccentric circles, they are designed for both base-in and base-out training and have all of the features of the original cards.

Key improvements with these cards:

1) A more obvious central anti-suppression check, the word KEEP is seen only by one eye, the word HERE is seen by the other eye, FOCUS is seen by both eyes.

2) When the circles are fused the letters in the word FOCUS have various degrees of disparity, causing some letters to same out towards the subject and some go further away.

3) We added a small "hash" mark at the top of the outer ring, which is seen by one eye, and another small "hash" mark on the bottom of the circle seen by the other eyes. This aids in reducing fixation disparity and improves alignment accuracy.

4) When wearing red/green glasses, these cards help with ensuring compliance in training as they force the patient to converge or diverge their eyes, depending on which side they hold the cards. For example, if the red card is on the left and the red filter is over the right eye, then the patient will have to diverge their eyes in order to fuse the two images.