Diagnostic Tools

Prices are available in CAD and USD. Use toggles at top of page to change. Face Fixation Sticks provide a series of detailed accommodation-stimulation targets for the young patient. The set consists of three (3) extremely durable plastic sticks with fixation faces smiling on one side and frowning on the other side. Single sticks can be used for performing various tests: unilateral (cover/uncover) test at near, alternating cover test at near, pursuit testing, near point of convergence (NPC), motilities (ductions and versions), vergence facility at near, fixation stability at near in diagnostic positions of gaze, amplitude of accommodation, and accommodative facility. Dual sticks with different opt types exposed to the patient can be used for saccade testing.

Prices are available in CAD and USD. Use toggles at top of page to change. 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.

Prices are available in CAD and USD. Use toggles at top of page to change. The discs in the magnetic version are encapsulated in a sealed clear plastic box. The patient selects the discs using a magnetic pen to move them into a scoring area. When complete, scoring is easily accomplished by reading the scores through the bottom of the box. Tip the box and shake the discs into the selection area for the next patient! Color testing becomes a game so that adults and children as young as 4 years old are much more engaged!

Prices are available in CAD and USD. Use toggles at top of page to change. This occluder uses a lightly frosted, scratch resistant lens that degrades the acuity of the non-tested eye while not inducing suppression effects. The reading eye is thus tested with an absolute minimum of interference from the fellow eye. The examiner is also able to see the non-tested eye through the frosting. This is important to see if the patient giving acuity results is “squinting” the fellow eye under the paddle. Likewise cover testing is made more reliable and informative because the examiner can see the movement of the covered as well as the un-covered eye.

Prices are available in CAD and USD. Use toggles at top of page to change. 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.