In the past, a straight edged segment of press-on prism was applied to the side of the field loss on both lenses. Success with this method was very limited. Today, however we have a new approach for press-on prism to treat visual field loss.
The New Method
Following the success with the approach developed by Daniel Gottlieb in his Visual Field Awareness System, the same approach may be used in applying a press-on prism. We stamp pokie games the press-on prism material with a round die that cuts a perfect circle. We file the edges to lessen reflected glare off rough points and mount it on the front surface. Unlike the traditional method, we mount the prism only on the lens of the effected side. We want to produce a diplopic image so the patient quickly picks up objects on the side of the field loss as the patient makes natural scanning movements.
The Gottlieb Visual Field Awareness System and In Wave Hemianoptic lens have superior optics to the press-on prism, but as an initial trial lens or as a less costly alternative, press-on prisms have an important place in our treatment of patients. The press-on prism also serves a role in testing patient response and correct prism placement prior to prescribing the Gottlieb Visual Field Awareness System or the In Wave Hemianoptic lens.