1. Design of Occupational Lenses
Progressives / Alternative Multifocals

2. Jon Torrey VP, PRIO/Computer Vision Essilor of America

3. Background

4. Fundamental Shift in Use of Vision
Past: Primarily distance vision
Today: Intermediate/ near

5. Computer Use by Presbyopes
Continues to increase:
Number of individuals
Hours/week/individual

6. Computer Use by Presbyopes
Driven largely by specific applications:
Social networking sites

7. Computer Use by Presbyopes
Baby boomers:
1st generation to use computers through majority of career
Continuing use into retirement

8. Computer Use by Presbyopes
Nature of Presbyopia: Loss of Accommodative amplitude
Necessitates a reliance on lenses to enable clear viewing at intermediate and near distances

9. LCD / Widescreen Displays
Rapid acceptance of technology has compounded the need for improved intermediate viewing, and specifically wider intermediate areas within lenses

10. Optometrists’ Quotes
“Up until now I basically gave up on these patients that have visual fatigue symptoms. I didn’t feel like I had anything to offer them in my clinical arsenal.”
“There really isn’t enough products for us to pick from for dealing with some of these accommodative disorders that we’re identifying.”
 “The progressives don’t cut it for those patients who spend great deals of time on the computer.”

11. Current Lenses: Design Limitations

12. Current Lens Designs: Limitations
Given nature of intermediate viewing at 50 – 70 cm, current lenses available are less than optimum:
SV – when set up for intermediate distance, no facility for more plus at near
No clear viewing at full distance

13. Current Lens Designs: Limitations
Bifocal – when set up “normally,” no clear area for intermediate distances
Typical response is for wearer to tip head back and lean forward

14. Current Lens Designs: Limitations
Bifocal – when set up for intermediate distances, with a small add for near viewing, wearer sacrifices clear distance vision

15. Current Lens Designs: Limitations
General-purpose PAL: intermediate area is 3rd priority, after Distance and Near
Intermediate area is narrow and located below center, requiring head tipping to see desktop screen clearly

16. Current Lens Designs: Limitations
Near Variable Focus lenses: significant step forward in visual flexibility and comfort
Many wearers still request full distance vision

17. Research – Design Preference
Patient preference in lenses for computer use, comparing general-purpose PAL with Near-Variable Focus design
97% of subjects preferred NVF design (Essilor, 2004)
81% of subjects preferred NVF design (PRIO, 2004)
1) Source: Essilor of America – Lens Comparison Survey - October ‘04 (40 subjects ages 45+) USA
2) Source: PRIO Corporation – Lens Comparison Survey - August ‘04 (40 subjects ages 45+) USA

18. Computer/Intermediate Lens - Ideal Design?

19. Ideal Lens: Design Factors
Feature set for ideal “occupational” lens for extended intermediate and near viewing would of course be a tradeoff between a variety of factors:
Vertical placement of intermediate power
Width of intermediate area
Slope of power curve

20. Ideal Lens: Design Factors
Percentage of prescribed add power delivered at fitting cross
Corridor length
Area of full distance power at top of lens
Minimum B measurement required

21. Ideal Lens: Delivery Factors
Just as important as the optical design factors are the “delivery” issues:
Rx prescribing requirements for Doctor (distance, intermediate, or near Rx?)
Fitting parameters for dispenser
Ordering information needed by lab

22. Essilor ComputerTM An Ideal Compromise

23. Essilor ComputerTM Design
Maximize intermediate area, both horizontally and vertically

24. Essilor ComputerTM Design
Accommodate ergonomic needs of majority of wearers
Screen
~60 cm
~4°
~30°
~30 cm
~45 cm
Keyboard

25. Essilor ComputerTM Design
AScalc [WNT] 2
DEGAUDED
Deliver 60% of prescribed add at Fitting Cross

26. Essilor ComputerTM - Benefits
Comfortable viewing at intermediate, near, and distance
Wide clear intermediate area to see the entire screen (or other intermediate object)
Some viewing at distance, to see across office
No more head tipping

27. Essilor ComputerTM - Fitting
Order just like normal progressive
Dot center pupil
Monocular Distance PDs
15 mm minimum Seg Ht
30 mm minimum B measurement
Rx Range: to +7.00D cyl to -4.00

28. Essilor ComputerTM - Uses
Besides computer viewing: Any Intermediate / near activity
Sewing
Carpentry
Auto repair
Cooking
Optometry
Painting
Scrapbooking

29. Essilor ComputerTM – Patient Wearing Trial

30. EC Lens – Patient Preference
Wearers satisfied with current vision at computer
PAL: n =33
1) Source: Essilor International – EC Lens Wearing Trial - October ‘05 (89 subjects ages 40+) UK, France

31. NOT satisfied with current vision: n = 30
EC Lens – Patient Preference
Wearers not satisfied with current vision at computer
NOT satisfied with current vision: n = 30
1) Source: Essilor International – EC Lens Wearing Trial - October ‘05 (89 subjects ages 40+) UK, France

32. Questions? Jon Torrey 503-781-8460 jtorrey@essilorusa.com
Thank You!
Questions?
Jon Torrey