Press-on Prism Visual Field Expanders
Press-on Prism Visual Field Expanders
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Following our success with the approach developed by Daniel Gottlieb in his Visual Field Awareness System, we now use the same approach when applying a press-on prism. We stamp 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. | ||
| We find the Gottlieb Visual Field Enhancement System optics to be far superior to the press-on prism, but as an initial trial lens or as a less costly alternative, it still has an important place in our treatment of patients. | ||
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In the past, a straight edged segment of press-on prism was applied to the side of the field loss on both lenses. Our success with this method was very limited. Today, however we use a new approach as outlined above. | |
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Order Our Videotape on Hemianopsia | |
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The Less Common Nasal Mount for Monocular Patients: If the patient does not have adequate vision in the eye on the side on the side of the hemianopsia, the field awareness system may be mounted on the nasal portion of the better eye. |
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The placement of the prism is critical. | |
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Click below to view a brief video of this patient using a
nasal press-on field expander due to blindness in the left eye which
would normally be used for the system temporally. Window Media Version |
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