插片三棱镜（Fresnel Prism and Lens ）
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Available with or without handle to allow for unobstructed, 360 degree rotation.
Raised ridge prevents prism edges from touching table.
* Allow accurate testing of large oculomotor imbalances in the trial frame.* Fits all standard trial frames, 38mm lens.
* Offers excellent optical qualities.
* Made of thin optical quality acrylic and are lightweight.
* Each set includes a display box.
* Available as two separate sets providing a full range of prisms. TS 4000: 2^, 3^, 4^, 5^, 6^, 8^, 10^ - with handles or without handles ORTS 5000: 12^, 15, 20^, 25^, 30^, 35^, 40^ - with handles or without handles
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Fresnel Prism and Lens (美国）
