Degressives

wider FOV for inter and near

smaller distance zone

abberations in the upper zone of the deg lenses as well- aka “office lenses”

any pre-presbyopic requiringmultiple inter+near WD

more than one near WD- smartphone, laptop,desktop

indoor spaces eg office space, tills,

near zone is primary zone

PPL set for DV & has plus power addition to lower lens

• lens centred on pupil center for DV

• near add will be inset for convergence during HV

Deg set for NV and has minus powered in upper lens

• lens centred to NCD (near centration distance), NOT IPD

• area with inter power will be outset

from “near upwards” , NOT “distance downwards”

specify heights and MOCs

• if design specify distance MOC, lens is inset 2mm in each eye

• is design specify near MOC, no inset for near, but DV/INT outset

minimum plus for near distance (same like PPLs)

has engravings nasally and temporally like PPLs- use deg lens chart, not PPL

start with near add = full add power for closest WD

if inter add needed, deg = difference btwn near and inter

farthest far clear point= reciprocal of add power ( accom relaxed)

nearest clear point = reciprocal of add power + available accommodation ( allow for reserve)

higher add = lower range of clear vision

younger presbyopes = lower deg bz more availble accom

dont advise reading rx, more flex options

no large power change

aimed at near & near intermediate

for SV NV wearers a wider ROCL (range of clear vision)