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Fresnel Lenses for Retinal Imaging

Photonics MarketplaceKnight Optical now offers stock and custom Fresnel lenses, for use within Retinal Imaging in a range of materials such as PMMA acrylic and borosilicate. Our Fresnel lenses consist of a flat surface with interspace concentric steps whereby each step corresponds to the surface of a conventional lenses. PMMA acrylic is a preferred material type used for retinal imaging Fresnel lenses. The Fresnel lenses are used as part of a system where its multi-focal length provide a multiple in and out of focus image that provide a magnified image of the human eye itself.

This stock range of fresnel lenses range from 5mm to 650mm aperture and contains both standard and precision ranges of fresnel lenses. The precision range has tighter tolerances with improved surface quality. These ranges are uncoated, however antireflective coatings can be applied at short notice. Typical specs: Borosilicate Material: PMMA Acrylic/ Center thickness: +/- 0.2mm Clear aperture: Nominal Focal length: Standard range ± 5% Precision range ± 2% typically (± 5% manufacturing data) Design condition: Parallel light on grooved side

Options available: Cutting down of stock lenses to custom sizes. Antireflective coatings. Other focal lengths and aperture sizes available at short notice.

All our Fresnel lenses are fully inspected on their quality in our ISO 9001 certified, state-of-the-art Metrology laboratory, using our Starrett AV300 video microscope for high accurate diameter testing. This allows us to work to the highest QA standards and meet the tolerance specifications on these precision components.More products