MULTIFOCAL AND PROGRESSIVE LENS DISPENSING

Question 1

What age does someone start experiencing presbyopia?

Answer 1

Usually around 40 years old

Question 2

What is presbyopia?

Answer 2

A condition which causes difficulty when completing close work

Question 3

What causes presbyopia?

Answer 3

Accommodation is the eye’s ability to increase its refracting power to focus on objects close to the
eyes and gets weaker as we age.

Question 4

What is ‘jump’ when referring to bifocals?

Answer 4

Jump results from the sudden introduction of base down prism at the dividing line of the segment.
For the customer, this results in an object appearing to ‘jump’ up as their eye looks through the segment top.

Question 5

What shape of bifocal segment is best dispensed to those who are long sighted?

Answer 5

Round segments

Question 6

What shape of bifocal segment is best dispensed to those who are short sighted?

Answer 6

D-segments

Question 7

What is Anisometropia?

Answer 7

Each eye has a significantly different prescription in each eye

Question 8

What defines a hard-style varifocal design?

Answer 8

A hard design is characterised by an extremely wide distance portion, wide reading portion and a very narrow intermediate corridor around which, the level of aberrational astigmatism increases rapidly to a high degree.

Question 9

What are the features of a soft-design varifocal design?

Answer 9

blending intrudes slightly upon the distance portion of the lens, wider intermediate area. Great for first time wearers,