Aspherical lens (indirect diagnostic lens) has a wide angle. It can be used with slit lamp microscopes, retinoscopes to diagnose the rear and the bottom of the eye's vitreous body. When used with a slit lamp or ophthalmoscope with the lens, retina, second nerve, macula luteal and capillary vessel can be observed expressly. Without touching the patient's eye, the image has a wide angle of view, large image and strong third dimension etc.
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