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for contact lens inspection - achromatic lenses (3 elements, 2 groups), photo-printed precise scale 0,1mm. Just to 20mm - focusing ring, magnification 7x - objective Ø19mm - field of view Ø18 mm - size Ø36x62mm
This device commonly used for contact lenses, may be used to measure the horizontal visible iris diameter (HVID) looking through the loop close to patient’s cornea similar to direct ophthalmoscopy