High Powered Lenses

plus lenticular lens

lens with an aperture & carrier portion, can help decrease the weight & lens thickness for a very high plus lens

either

are plus lenticular lenses spheric or aspheric?

CR-39

what lens material are most multi-drop (continuous) aspheric plus lenticulars?

digital surfacing

how are full field, high index aspheric produced?

myodisc lenses

specific minus lenticular lenses w/ a flat, or almost flat, front surface; the cyl power is usually on the front, & the carrier is plano

flat

describe the front surface of a myodisc lens

front

where is the cyl power on a myodisc lens?

plano

the carrier portion of a myodisc lens is ______

thicker

the larger the bowl of a myodisc lens, the _______ (thicker/thinner) the carrier

thicker

the higher the lens power of a myodisc lens, the ______ (thicker/thinner) the carrier

plano

what is the carrier power of this minus lenticular lens?

plus, thinner

this minus lenticular lens has a _____ carrier, making the carrier ______

low minus, allows more minus to be created overall (but edges are not ideal)

what is the power of the front surface of this minus lenticular lens? what is the benefit of it?

low minus, plus

this minus lenticular lens has a _______ front surface, but a ____ back carrier surface

full field lens

when possible, the first choice for a high minus lens is a _______

higher, lower

a full field high minus lens is made with a _______ minus back surface & a ______ minus front surface

any (use higher index, higher Abbe if concerned about CA)

what lens material can a full field high minus lens be made in?

minus on both sides, thus there are bowls on both sides but the bowls are large enough to cover the frame’s lens opening

how does the lab make a full field high minus lens?

thickness of the semi-finished lens blank

the bowl diameter on a full field high minus lens is limited by the __________