FOR A PRACTICING EYE SPECIALIST,TWO EQUIPMENTS ARE VERY MUCH NECESSARY.ONE IS AUTO REFRACTOMETER AND ANOTHER IS SLIT LAMP.A.R.METER IS NEEDED TO KNOW THE REFRACTIVE POWER OF EYES AND FOR PRESCRIBING SPECTACLES AND SLIT LAMP IS USEFUL TO DETECT CORNEAL DISEASES,LENS STRUCTURE .IT HAS GOT MANY ATTACHMENTS ALSO LIKE GONIOSCOPE ETC.FIRST PIC IS A R M, SECOND IS THE SLIT LAMP