Abstract: A system and associated methods are disclosed for objectively assessing the vision of a user using a computing device. In at least one embodiment, upon an assessment application in memory on the computing device being initialized, a baseline profile is established for the user based on a current state of an at least one visual parameter associated with a display screen of the computing device. The assessment application selectively modifies the at least one visual parameter periodically, and then monitors and records the user's response to the modifications. The user's responses are compared to the baseline profile and, upon the responses exceeding a pre-defined threshold Delta value, the assessment application notifies the user of a possible change in their vision.