Fundus Vessel Check Double Slit Lamp Addon Retina Lens 20D / 78D /90D Examination Ophthalmic Tools Diagnostic
right using direction and may provide for best image quality;
2.Keep the lens centring on the patients pupil;
3. Hold the lens far enough from the patient's eye so that the retinal image has the same diameter with the lens;
4.Keep the illumination sources as dark as possible to minimize reflections and image contrast;
5.Keep the lens clean to minimize glare from the lens surface





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