Histogram	Negative
RGB separation	Red Free
Zoom	Brightness & Contrast Adjustment
Datum - Facility to automatically set the image brightness to that of a "perfect" image	Elliptical Ratios - ideal for tracking patient's cup to disc ratios.
Draw round an area and label that area	Intensity profiles
Put defect markers on the image i.e. Microaneurysm, Blot Haemorrhage, Exudate, New Vessels, Abnormal Vessels, etc.	View one image over another. Use this to compare images directly.
Data Table - Quickly see how a patient's Cup to disc ratios and intra ocular pressure's have changed from previous visits	Sharpen Image

Movie - Show a set of images as a continual movie, ideal for fluorographies. The images can be aligned using 2 different methods. The brightness and contrast can be altered and the images can be made negative. You can play the images at different speeds or you can step through them.