Rule of thumb for measuring 7/35 tri

[Kristen P]

where do you measure for a lined trifocal? 1/2 way in between the pupil and lower lid, or at the bottom of the pupil?

[Ed_Optician]

According to the textbook it should be lower pupil. My suggestion otherwise would be look at where they are currently wearing his/her trifocals.
Ed

[HarryChiling]

Bottom of the pupil, but make sure to fit it similar to a prgressive in regradss to the vertex, fit it close.