Hi , the glasses we ordered from a online store is hard to stay on my little boys face, as it slips off and his head is small so the blue things that hold it on are too large for his small head and do not hold the glasses on. So I need to buy some lenses to have put in his current glasses frames.
Dimensions of the frame

42 inch frame
Bridge 16
Depth 31
Diagonal 42 (ED)
+18
Pupil Distance 44

Frames are as follows
Supplier: aviva
Brand Name : Active
Model 17081
Colour - light blue
Size - 42

omega seamless lenses

1.67 index super thin lenses
All the details for the lenses I require are above, please can you help me out?