patency (plural patencies). ( 1 medicine) The degree of openness of a tube, such as a blood vessel or catheter; the relative absence of blockage. ( 2 uncountable) Obviousness; clarity.
Maximum Length: 16' with a standard cable, Up to 50' with a high quality cable. VGA is an analog signal and so as distance increases the quality will decrease. A lot of factors can determine the maximum cable length, but for low resolutions (up to 800x600) you can reach 100 feet and beyond without too much trouble. For mid-range resolutions of 1280x1024/1024x768 you can typically reach somewhere between 50 to 100 feet.
The quality of a display system largely depends on its resolution, how many pixels it can display, and how many bits are used to represent each pixel. VGA systems display 640 by 480, or about 300,000 pixels. In contrast, SVGAsystems display 800 by 600, or 480,000 pixels.