The most common symptoms of presbyopia occur at around age 40 for most people, and typically involve a gradual deterioration of ability to read or do work up close. With this group of user needs’ in mind, Pentax AllFocus lenses are designed to make focusing at all distances a breeze by leveraging Pentax’s advanced software that is capable of simulating real wearing conditions, thus providing the user a sharp vision. This technology also enable the users to adapt rapidly to the changing visual response in their surroundings.