7/15/2015 1 Spectacle Lens Update: Everything you need to know Michael C. Vitale, ABOM, LDO, NCLC Technical Director & Lens Division Liaison The Vision Council [email protected]Michael Vitale has no financial interests to disclose Click to edit Master title style Impact of Good Vision Average eyewear lifespan... > 28 months Eyewear will be used for... > over 30,000 miles of driving > viewing 49 or more movies > 2.2 weddings / graduations > 26 family events & holidays > 1 in 3 presbyopes will see a grandchild for the 1 st time Click to edit Master title style Spectacle Lens Update Header Example Goes here Areas of Performance > Design > Surface > Filter > Substrate
19
Embed
7/15/2015 Spectacle Lens Update: Everything you need … · Spectacle Lens Update: Everything you need to know Michael C. Vitale, ... Spectacle Lens Update ... -Magnification for
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
7/15/2015
1
Spectacle Lens Update:Everything you need to know
Michael C. Vitale, ABOM, LDO, NCLCTechnical Director & Lens Division LiaisonThe Vision [email protected]
Michael Vitale has no financial interests to disclose
Click to edit Master title style
Impact of Good Vision
Average eyewear lifespan...> 28 months
Eyewear will be used for...> over 30,000 miles of driving> viewing 49 or more movies> 2.2 weddings / graduations> 26 family events & holidays> 1 in 3 presbyopes will see a
grandchild for the 1st time
Click to edit Master title style
Spectacle Lens UpdateHeader Example Goes here
Areas of Performance> Design> Surface> Filter> Substrate
7/15/2015
2
Spectacle Lens UpdateSingle Vision Lens Design
Historically> Spherical Lenses
» Corrective Curve Design- Optical Aberrations- Magnification for plus power lenses- Field of view Issues
> Steep curves» Difficulties fitting in todays flatter frame front designs
Spectacle Lens UpdateSingle Vision Lens Design
Spherical lenses create peripheral distortion because light is unequally refracted across the lens surface...
Spherical lenses create peripheral distortion because light is unequally refracted across the lens surface...
.......
multiple points of focusmultiple points of focus
Spectacle Lens UpdateSingle Vision Lens Design
Historically> Asphericity
» Reduces Optical Aberrations- Less magnification for plus power lenses- Less distortion- Increased field of view
> Cosmetically Flattens» Allows for flatter, thinner lenses
7/15/2015
3
Spectacle Lens UpdateSingle Vision Lens Design
Aspheric/Atoric lenses use multiple curvatures to reduce peripheral defocus and aberration.Aspheric/Atoric lenses use multiple curvatures to reduce peripheral defocus and aberration.
single focal pointsingle focal point
Spectacle Lens UpdateSingle Vision Lens Design
What’s New Now!
As Worn or Compensated Single Vision Lenses> The Rx is compensated to take into account the following
» Pantoscopic Tilt» Face form (Wrap Angle)» Vertex Distance
> Increases field of view> Less distortion
Products
Click to edit Master title style
Questions?Comments?
7/15/2015
4
Spectacle Lens UpdatePAL Lens Design
PALs Should Provide> Natural Reading Posture
» greater comfort while reading> Optimized Zone Placement
Natural Reading PostureShorter progressions provide more natural reading postures...Shorter progressions provide more natural reading postures...
...a natural reading posture relies primarily on head movements...a natural reading posture relies primarily on head movements
Image courtesy of E
ssilor of Am
erica
Spectacle Lens UpdatePAL Lens Design
Optimized Zone PlacementDistance Rx and ADD power determine optimal zone placement...Distance Rx and ADD power determine optimal zone placement...
...true multi-design PALs optimize zones for ametrops, for easier adaptation...true multi-design PALs optimize zones for ametrops, for easier adaptation
MYOPEMYOPEHYPEROPEHYPEROPE
7/15/2015
5
Spectacle Lens UpdatePAL Lens Design
Binocular WidthThe ability to maintain fusion is called "binocularity" The ability to maintain fusion is called "binocularity"
...binocularity determines width- not the spherical area of the channel...binocularity determines width- not the spherical area of the channel
Image courtesy of E
ssilor of Am
erica
Spectacle Lens UpdatePAL Lens Design
Binocular WidthPatented Design Technology allows specific alignment of astigmatism... Patented Design Technology allows specific alignment of astigmatism...
...this increases binocularity- and therefore intermediate width...this increases binocularity- and therefore intermediate width
Image courtesy of Essilor of America
Spectacle Lens UpdatePAL Lens Design
Sharper Distance VisionNew Design Technology controls aberrations in the distance zoneNew Design Technology controls aberrations in the distance zone
...control of aberrations provides clinically proven gains in contrast...control of aberrations provides clinically proven gains in contrast
7/15/2015
6
Spectacle Lens UpdatePAL Lens Design
Progressions can be designed specifically to a taskProgressions can be designed specifically to a task
STANDARD DISTRIBUTIONFAR DISTRIBUTION NEAR DISTRIBUTION
Specialized Design
Spectacle Lens UpdatePAL Lens Design
Specialized DesignProgressions can be designed specifically to a frame typeProgressions can be designed specifically to a frame type
SHORT DISTRIBUTIONSTANDARD DISTRIBUTION
Spectacle Lens UpdatePAL Lens Design
Specialized DesignProgressions can be designed specifically to an RxProgressions can be designed specifically to an Rx
OPTIMIZED ZONESSTANDARD DISTRIBUTION
7/15/2015
7
Spectacle Lens UpdatePAL Lens Design
Specialized DesignProgressions can be designed specifically to a patient characteristicProgressions can be designed specifically to a patient characteristic
HEAD MOVEREYE MOVER STANDARD DISTRIBUTION
Spectacle Lens UpdateFitting & Dispensing
Products> Traditional & Freeform
» Thanks to the Lab Division of TVC
> Freeform» Thanks to Vision Care Product News
“Computer Glasses”?
“Task Specific”> Helps the eye adjust to intermediate-distance objects
such as computer screens» A modified lens power provides the consumer with a large
field of view» Too many products to mention, reference the Progressive
Lens Identifier
> Powerboost “single vision” lenses for non-presbyopes» Zeiss, Hoya, Essilor, etc.
> Over the counter products such as GUNNAR> Custom designed
» Double FT/Rd seg» Inverted» Golf seg
7/15/2015
8
Spectacle Lens UpdateFitting & Dispensing Proper fitting is crucial to the
performance of ANY and ALL designs> Proper adjustment of the frame
» Faceform» Pantoscopic Tilt» Vertex Distance
> Proper placement of the optics» Monocular PD’s» Monocular Fitting Heights
An improper fit will compromise the performance of ANY designFitting increases in importance with design complexity
Click to edit Master title style
Questions?Comments?
Spectacle Lens UpdateLens Surfaces
High Performance Surfaces Provide> Hardcoating – Thermal and UV
» sharper vision» increased night vision» better cosmetics
> Hydrophobic & Conductive Layers» easier to clean» greater durability
7/15/2015
9
Spectacle Lens UpdateLens Surfaces
Thermally-cured HardcoatThe lifespan of a lens is determined by the durability of the surfaceThe lifespan of a lens is determined by the durability of the surface
...surfaces are thermally bonded into the substrate...surfaces are thermally bonded into the substrate
SU
BS
TR
AT
EPrimerPrimer
Silica-Resin HardcoatSilica-Resin Hardcoat
Spectacle Lens UpdateLens Surfaces
Multi-Layer AR StackSurfaces include a multi-layer AR for increased transmissionSurfaces include a multi-layer AR for increased transmission
...AR also reduces night-time reflections/glare and provides superior cosmetics...AR also reduces night-time reflections/glare and provides superior cosmetics
SU
BS
TR
AT
E
Multi-Layer AR
Spectacle Lens UpdateLens Surfaces
Hydrophobic & Conductive Layers
An AR incorporating a TCO (transparent conductive oxide) will repel dust and other particlesAn AR incorporating a TCO (transparent conductive oxide) will repel dust and other particles
...a hydrophobic layer repels water & oil-resulting easier and less frequent cleaning...a hydrophobic layer repels water & oil-resulting easier and less frequent cleaning
SU
BS
TR
AT
E
Hydrophobic Layer
7/15/2015
10
Spectacle Lens UpdateLens Surfaces
Hydrophobic & Conductive LayersHydrophobic durability is a function of coating density...Hydrophobic durability is a function of coating density...
...higher densities lead to a longer effective hydrophobic lifespan...higher densities lead to a longer effective hydrophobic lifespan
Imag
e co
urte
sy o
f Ess
ilor
of A
mer
ica
Spectacle Lens UpdateLens Surfaces
Include high-performance surfaces on your lenses> Nearly all patients want:
» Increased visual acuity» better night vision» increased durability» ease of cleaning» less noticeable eyewear
60% of all US eyewear consumers choose AR when informed of its benefits
Click to edit Master title style
Questions?Comments?
7/15/2015
11
Spectacle Lens UpdateLens Filters
Lens Filters> UV Filters> Photochromic’s
» adjustable filtering» UV protection
> Polarized» glare reduction» superior contrast» sport & vocational applications» UV protection
> Fixed Tint» neutral & selective filters
> Specialized Filters/AR Coatings» Selectively filters blue light and UV
Ultraviolet Filters> There are 3 types of UV
» UVC < 285nm» UVB 286 – 320nm» UVA 320 – 380nm
» HEV > 380nm
Only 2 materials do not block UV» clear CR-39» clear glass
Spectacle Lens UpdateLens Filters
ozon
e
Spectacle Lens UpdateLens Filters
Ultraviolet Filters> On average, 80% of UV exposure will occur
prior to age 20
100% UV protection is a standard-of-care requirement for all children> Polycarbonate or Trivex> brimmed hats> sunscreen
7/15/2015
12
Spectacle Lens UpdateLens Filters
Photochromic lenses provide> Comfortable vision in nearly all lighting conditions
> Complete protection from UV
Image courtesy of Transitions
Spectacle Lens UpdateLens Filters
Polarized Filters provide> reduction of glare
» reflections from flat surfaces are reduced or eliminated
> increased contrast sensitivity» selective filtering of glare
> sport & vocational applications» watersports» driving
Spectacle Lens UpdateLens Filters
Reduction of glare
Non-polarized light contains energy along all axes along its directionNon-polarized light contains energy along all axes along its direction
...a polarizing filter polarizes light along a single axis...a polarizing filter polarizes light along a single axis
7/15/2015
13
Spectacle Lens UpdateLens Filters
Reduction of glare
When light hits a smooth transparent surface, polarization occursWhen light hits a smooth transparent surface, polarization occurs