Volk® Digital Clear Field indirect BIO lens, blue ring, 55°/72° FOV, 2.79x image mag., 0.36x laser spot, 37.0mm working distance, ideal for highest resolution pan retinal examination | Ambler Surgical
Volk 20D ACS Pink Lens
Volk®1 Single-Use 20D (1 box of 10) – Volk Optical
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Amazon.com: 20D Condensing Lens (For use with BIO for indirect ophthalmoscopy) (Purple) : Health & Household