Lens Thickness and how to choose a ideal frame.

3. MDA – Greater width of the rim or diagonal -
Obtained by scanning with the ruler
PA – Bridge+Rim - as always in the height where
position the optical centers.

4. A – width rim
B – lens height
DEL – Distance between lenses
The virtual rectangle that
contains the rim
determines the
dimensions of the frame.

6. • Influence in the analysis frame, as measurements are
marked on the stem width "bridge" refers shaft length
where the proposed new "bridge" is in fact the distance
between the lenses.
• This can influence particularly in automatic assembly
where assemblers use the bridge information to fitting
rimless and semi rimless glasses.

7. The end of one lens to
the other one.
“BRIGDE+RIM”

8. “BRIGDE+RIM”
Distance between centers
of the rims

10. DP
Pupillar Distance

12. Influence of the Bridge+Rim measured
and rim size on plus lens thickness.

13. Influence of the Bridge+Rim measured
and rim size on plus lens thickness.

15. Minus lenses

16. TECHNICAL FRAMES

17. Same lens mounted on frames with
different “Bridge+Rim”

18. Big Frames

19. Big Frames

20. Big Frames
dm – Fitting decentralization
da – Height decentralization
𝑑𝑚 =
𝑃𝐴 −𝐷𝑃
2
=
𝑃𝐴
2
− 𝐷𝑁𝑃
∅ = 𝑀𝐷𝐴 + 2 × 𝑑𝑎 𝑜𝑢 𝑑𝑚
Whichever is greater
𝑑𝑎 = 𝑓𝑖𝑡𝑡𝑖𝑛𝑔 ℎ𝑒𝑖𝑔ℎ𝑡 −
𝑟𝑖𝑚 ℎ𝑒𝑖𝑔ℎ𝑡
2
Fast way to determine diameter

22. - 30,00 dioptrias +20,00 dioptrias

24. “Blending” Edge

25. This type work performed in the left minus lenses
was called "visodrop" or "myodisc" is an alternative
to strong diopters.

26. THANKS
THANKS