Optego Prisms
Optego Prisms
Optego Prisms attach very easily to eye glasses and are made from a silicone-like material.  Manufactured in the USA with our Clear Prism® Technology Protocol.  Use the whole prism:  30% more surface area than other competing products.
not rated $24.50 Select options
Vergence Facility Prism
Vergence Facility Prism
Vergence Facility testing has been shown to be one of the most important methods of detecting patients with binocular vision disorders and symptoms. Diagnosis of non-strabismus binocular vision abnormalities can be improved through the use of vergence facility testing at near. The test is performed at 40 cm as the patient views a vertical 20/30 target or similar. Twelve diopter base out (BO)and three diopter base in (BI) prism is alternately placed before one eye; the patient is asked to report when the target becomes single and clear. This prism change is repeated for one minute and the clinician records the number of cycles performed during testing. Presence of suppression is indicated by a perceived lateral movement of a single target moving left or right of center, or no observed eye movement. For testing at near, the recommended failure criteria is 15 cycles per minute which is easily recalled (sum of BI and BO demands). Recent research has shown this criteria valid for pediatric, adult and presbyopic populations. Vergence facility testing allows the clinician to quickly identify patients with binocular vision problems in a primary care examination. The procedure requires less than 2 minutes of chair time, inexpensive equipment and minimal patient cooperation. Vergence facility has a sensitivity of 0.80 (correctly identifying binocular vision problems) and a specificity of 0.65 (correctly identifying normal binocular vision) and therefore maybe used as screening a test for binocular vision problems. Vergence facility testing is easy to learn and can be administered by a technician.
not rated $18.50 Add to cart
Vergence Facility Stick
Vergence Facility Stick
Vergence Facility Stick tests for binocular vision disorders and symptoms. Highly portable, easy to use with minimal difficulty for the patient.
not rated $20.00 Add to cart
Vertical Prism Bar
Vertical Prism Bar
Sizes - 1-2-3-4-5-6-8-10-12-14-16- 18-20-25-30. Our prism bars are made of extremely high quality plastic, which are optically clear with an index of refraction of 1.49 and a light transmission value of 92%. The manufacturing process greatly reduces optical strain, producing prisms that virtually eliminate clinical birefringent effects.
not rated $140.70 Select options
Horizontal Prism Bar
Horizontal Prism Bar
Sizes - .5-1-1.5-2-3-4-5-6-8-10. Our prism bars are made of extremely high quality plastic, which are optically clear with an index of refraction of 1.49 and a light transmission value of 92%. The manufacturing process greatly reduces optical strain, producing prisms that virtually eliminate clinical birefringent effects.
not rated $127.30 Add to cart