20D Double Aspheric Lens - High-Quality Optical Lenses for Clear Vision | Perfect for Eyeglasses, Cameras, and Scientific Instruments

Product Description BEXCO 78D Double Aspheric Lens Magnification 0.77X, Working distance 10mm. Good all-around lens. Ideal option if the practitioner uses a single lens. Typically, the 78D with 0.77x magnification is a versatile all-around lens; if practitioners are to own just one lens, this may well be the best choice BEXCO 90D Double Aspheric Lens Magnification 0.64 X, Working distance 8 mm. Purpose- View the posterior pole using a slit lamp. Good general purpose lens. Alternative to 78D if the practitioner elects to use just one lens. BEXCO 20D Double Aspheric Lens Magnification 2.97X, Working distance 47 mm. View the retina including periphery using a head-mounted BIO Higher magnification than 28D. Ideal for pediatric examination, when scleral indentation is required and for patients with nystagmus. Useful when slit lamp examination is not possible. BEXCO 28D Double Aspheric Lens Magnification 2.1 X, Working distance 31 mm. Purpose-View the retina including periphery using a head-mounted BIO. Lower magnification than 20D. Ideal for pediatric examination, when scleral indentation is required and for patients with nystagmus. Useful when slit lamp examination is not possible.