Guiding Manual on Selecting Progressive Glasses
Wednesday, November 25th, 2009The ophthalmology and prescription of the progressive glasses is totally different from that of presbyopic glasses and bifocal glasses. It needs more scientific ophthalmological technology and stricter operating process. If any single chain of the whole process turns out to be wrong, it will not only result in money wasting but also be harmful to the health of consumers. Therefore, on one hand, the ophthalmologist should adhere to the professional morality. On the other hand, we, as consumers, need to have some basic knowledge on selecting progressive glasses.
Firstly, we need to know what we want and ask the ophthalmologist to examine our eyes to make sure whether there is a need for us to wear a pair of progressive glasses.
Secondly, if the examining result turns out to be that we have the need to wear progressive glasses, then the ophthalmologist will do optometry on our eyes—optometry both in near distance and far distance. Next, the ophthalmologist will use FCC as the elementary reading additional glasses for us, basing on our ages, errors of refraction, the present eyesight.
Thirdly, choose and adjust the frame of the glasses. In the process of selecting a suitable pair of progressive glasses, the adjustment of the frame is very important. The following ten points should be carefully noticed:
1. The frame should enjoy a good stability. Generally speaking, you’d better not choose glass frame without brim, or the frame tend to warp.
2. The glass frame should enjoy enough vertical height, or the myopia part of the glasses is inclined to be cut away when the worker are doing severing work. Currently, the vertical height of the frame should not less than thirty-five millimeters.
3. The space below the glass circle and above the bridge of nose should be broad and deep enough to contain the progressive zone. It is better not to use Ray Ben frame which enjoys a space of highly slanting degree below the glass circle and above the bridge of nose.
4. The frame should be equipped with pseudostipules that have the performance of adjusting vertical height.
5. Under the precondition that the frame keeps no touching of the eyelashes, the smaller of the space between the frame and eyes is, the better the effect of wearing progressive glasses will be. After choosing the frame you like, try on it and then make some proper adjustment.
6. Make sure that the radian of the spherical surface in front of the frame tallies with the radian of your forehead.
7. Keep the frame balanced. Well tune the angle of the legs of the glasses so that the frame could be worn rightly on your face.
8. Oblique angle in front of the frame should be adjusted to 10~15 degrees lest that the frame should be in touch of face.
9. Adjust the pseudostipules so as to shorten the distance between the glasses and your eyes. The shorter the distance is, the better. But you should keep the glasses without the touch of your eyelashes.
10. The legs of the glasses should be well tuned until the frame is stably worn and you feel comfortable.
At last, the ophthalmologist will measure the horizontal distance (pupillary distance) and the vertical height.

