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20D lens PMMA (oDocs Optics) – oDocs Eye Care
Amazon.com: OPTICLEAR 20D Aspheric Lens for General Examination of The Fundus Using “Binocular Indirect Ophthalmoscope (BIO) : Industrial & Scientific
Pale Yellow Colour 20D Lens With Box | eBay
BIO Lens- 20D – Lenscan Medical Inc.
Volk 20D lens, Double Aspheric, Yellow Tinted, Perfect Condition, Made In USA. - Camera Concepts & Telescope Solutions
Volk® 20D BIO lens, blue ring, 46°/60° FOV, 3.13x image mag., 0.32x laser spot, 50.0mm working distance, ideal for imaging of the macular and optic disc | Ambler Surgical