Progressive eyeglasses take use of progressive lenses that feature an advanced gradient of increasing lens power. While most patients know those potential benefits brought by wearing progressive lenses glasses, those with little experience may do not know how to use these glasses in a right way. Progressive reading glasses differ considerably in lens design and thus power provision. Even though things or objects at all distances are within the capability of progressive lenses, how to manage the viewing tasks is still critical. Without a proper means, those benefits could not be gained. In some cases, even unwanted side effects or problems will be caused. This is quite understandable that each kind of complex device or instrument will certain require more skills of use and management. Progressive lenses spectacles need similar care.
Because a progressive lens combines a range of powers in a single surface, the vertical range of undistorted vision at each part will be narrowed. What is the consequence? Commonly reported visual side effects associated with progressive lenses glasses include visual distortion and peripheral vision loss. Some presbyopic patients have to tilt the head to sight through the appropriate part of the vertical progression, if they want to gain clear vision at different viewing distances. This could be considered as a way of adaption. For those who have never used progressive glasses, this process of adaption or adjustment is necessary or inevitable. Adjustments of head position are the easiest way to get an appropriate lens location of the correct addition power. The reason is that near visual tasks are usually low in the visual field and distance objects are higher in the visual field.
A worse case is that some people may have difficulty becoming used to the head movement. All in all, this is not the natural practice. Now, many opticians or optometrists recommend occupation-specific progressive lenses glasses. For instance, a customized pair of progressive reading glasses can be made with a wider intermediate part or reading part.
C: Progressive lenses glasses usually require new users to undergo a period of adjustment. They often need to tilt their heads slightly to sight through the appropriate part of the vertical progression.