Choose between different sized individual stick prisms which are mounted on a handle for easier use.
Holding the stick, rather than the prism itself keeps the prism free of finger marks, keeps your hand away from the face when testing and makes it easier to introduce the prism without touching or distraction.
The handle also allows you to introduce the prism at 90 degrees to the prism base which makes it easier to the see any movement of the eye behind the prism. For example, bringing the base out 20^ prism vertically down from above the eye makes it easier to see the horizontal eye movements.
Each of the four stock sizes have specific uses in orthoptic practice.
Four sizes available: 4, 10, 15 and 20 Diopter.
The 4 diopter prism can be used to differentially-diagnose between the presence of a microtropia and bifoveal single vision. N.B. A positive response for microtropia is sometimes found with anisometropic amblyopia, the response changes to normal BSV when the correct spectacles are worn.
The 10 diopter prism is used to indicate the presence of amblyopia when a vision test is not possible. An article on how to perform the test and its efficacy can be downloaded here.
Use instead of a 20 diopter in patients especially those with exophorias, who are unable to overcome a 20 diopter base out prism.
Use base out in front of each eye to establish the presence and quality of motor fusion. A link to information on how to perform the test correctly can be downloaded here.
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