SLIT LAMP: --------------------- Most Effective tool for Dry Eye Slit Lamp Variants: ------------------------------- iS 7, Slit Lamp Microscope | 5 step New Optics with inbuilt Yellow filter | LED iS 7 Digital, Slit Lamp Microscope | 5 step New Optics with inbuilt Yellow filter | LED | Digital System with Software. iS 7 Digital (WDR), Slit Lamp Microscope | 5 step New Optics with inbuilt Yellow filter | LED | Digital System with Infrared function for meibomian glands examination.