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