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PROGRESSIVE ADDITION LENS:   OPTICS AND DESIGN SHRESTHA GS, M.Optom
Presbyopia correction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
RANGE OF CLEAR VISION Single vision Bifocal Progressive 0.33 0.50 1.00 2.00 5.00 NEAR INTERMEDIATE DISTANCE NEAR INTERMEDIATE DISTANCE NEAR  INTERMEDIATE  DISTANCE
PURPOSE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
What are progressive addition lens ?
Physiological Considerations Distance Intermediate Near Typical dioptric power (D) for clear viewing of objects
[object Object],Usable Field of View Eye rotation Head movement PALs design and personal movement characteristics
Binocular Vision Binocular vision: As the patient’s gaze is lowered for near objects, the eyes converge to maintain a single binocular image. The progressive lenses should ensure that this is maintained for different object distances from the eyes, as illustrated by the lines.
Peripheral (Extra-Foveal) Vision Peripheral vision: The PAL design should ensure that *objects in the periphery of the visual field are easily fused. **The distribution of prism in each lens should also be balanced for binocular viewing. ***Corresponding areas in the two lenses should provide a similar level of vision.
Why Use PALs? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Feature Benefit
Intermediate Vision ,[object Object],[object Object],(a)  Bifocal (b)  PAL
Why Use Progressive Lenses? Bifocal   lens Progressive lens The bifocal lens (left) can disrupt the patient’s view with visual disturbances (arrows) when the eye crosses the boundary of the near seg. The progressive lens (right) has no such problem and enables a smooth transition between different reading distances.
PAL references
 
How a progressive addition lens works? ,[object Object],[object Object],[object Object],Width  = Lens design + Add Astigmatic error  = Width of near area + add
Progressive Lens Design - Optics Distance Zone Near  Zone Umbilical line Intermediate  Zone Lens Radius Changes Along Umbilical Line
Principal parameter :  ,[object Object],[object Object],[object Object]
Design in PAL’S : ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Progressive Lens Design 2.  Hard  Vs  Soft Lens Design Hard Soft
Hard design ,[object Object],[object Object],[object Object],[object Object],[object Object]
Advantages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Soft design : ,[object Object],[object Object],[object Object],[object Object]
Width of Far  V ision (+4mm): 0.5 [D]-  16.2 mm 1.0 [D]-  Unlimited Max Cylinder [D]- Nasal:   1.5[D] Max Cylinder [D]-  Temporal:  1.5 [D] Width of Corridor  (-6mm): 1.0[D]-  9 mm Length of   corridor: 14.2 mm Minimum fitting: 19  mm Width of near Vision (-18 mm): 1.0[D]-  21.63 mm   Soft Design
Advantages ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Indication for selection  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Symmetrical design : ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
Asymmetrical design : ,[object Object],[object Object]
Progressive Lens Design 3.  Symmetrical  Vs  Asymmetrical Symmetrical PAL - same lens design is rotated to fit the other eye Asymmetrical PAL - each eye has a different lens
[object Object],[object Object],[object Object],[object Object]
Mono design :  ,[object Object],[object Object],[object Object],[object Object]
Multi design : ,[object Object],[object Object],1.50 Add Design 2.00 Add Design 2.50 Add Design
Prescription base design :  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Incorporating  Single vision aspheric design in to the PALs ,[object Object],[object Object],[object Object],[object Object],[object Object]
USE OF CONTOUR PLOT TO EVALUATE PROGRESSIVE LENSES ,[object Object],[object Object],[object Object],Areas of equal cylinder power plotted with a connecting line-  Isocylinder line Equal spherical equivalent powers-
 
Lens Design Selection ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],Knowledge continues to Evolve Summary
Disadvantage of PALs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Rodenstock Perfect read R ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Varilux readable ,[object Object],[object Object],INTERMEDIATE +0.75 +0.75 12mm 4mm 28 mm
Cosmolit P ,[object Object],-0.75D Add 20mm 10mm
Overview ,[object Object],41mm Add-0.50 9mm
Technica ,[object Object],Distance Intermediate Near MRP: 50% 0f add
Some of the common Progressive lens from essilor ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Sola Progressive ,[object Object],[object Object],[object Object],[object Object],XL Graduate
Computer lens 12 mm power transition zone Access uses a unique aspheric surface: Upper portion for mid-range distances Lower portion has reading Rx Power varies smoothly from top to bottom Mid-range Near
ACCESS TM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
mc  compared to Adult  Progressive Lenses Addition Power  Plot mc  Myopia Control Standard Adult Progressive Short Corridor Adult Progressive
Eye tracking
R1 Far Zone Rn Progressive Zone R2 Near Zone Controlling the distortion is the key to the ultimate progressive lens Topographic Map Minimizing Distortions
The technology that enables us to design progressive lenses through an exact simulation of the natural human eye view. Eye Point Technology
The optical power is created by 3 parameters: thickness, index and curvatures  The surface of the lens is scanned by a 3D measuring system, mapping the curvatures of the lens. Eye Point Technology
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Eye Point Technology
Visual Simulator
Panamic Panamic Rodenstock Life 2 Hoya GP Wide Zeiss Gradal Top Sola Max Analyzed by Rotlex Class I on a random lens Panorama Gold Comparison
Rodenstaik life II Sola Max Sola Max Panamic Rodenstock Life 2 Hoya GP Wide Zeiss Gradal Top Comparison
Comparison
Hoya GP Wide Hoya GP Wide Panamic Rodenstock Life 2 Zeiss Gradal Top Sola Max Zeiss gradal top Comparison
Thank you

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Progressive addition lens1

  • 1. PROGRESSIVE ADDITION LENS: OPTICS AND DESIGN SHRESTHA GS, M.Optom
  • 2.
  • 3. RANGE OF CLEAR VISION Single vision Bifocal Progressive 0.33 0.50 1.00 2.00 5.00 NEAR INTERMEDIATE DISTANCE NEAR INTERMEDIATE DISTANCE NEAR INTERMEDIATE DISTANCE
  • 4.
  • 5. What are progressive addition lens ?
  • 6. Physiological Considerations Distance Intermediate Near Typical dioptric power (D) for clear viewing of objects
  • 7.
  • 8. Binocular Vision Binocular vision: As the patient’s gaze is lowered for near objects, the eyes converge to maintain a single binocular image. The progressive lenses should ensure that this is maintained for different object distances from the eyes, as illustrated by the lines.
  • 9. Peripheral (Extra-Foveal) Vision Peripheral vision: The PAL design should ensure that *objects in the periphery of the visual field are easily fused. **The distribution of prism in each lens should also be balanced for binocular viewing. ***Corresponding areas in the two lenses should provide a similar level of vision.
  • 10.
  • 11.
  • 12. Why Use Progressive Lenses? Bifocal lens Progressive lens The bifocal lens (left) can disrupt the patient’s view with visual disturbances (arrows) when the eye crosses the boundary of the near seg. The progressive lens (right) has no such problem and enables a smooth transition between different reading distances.
  • 14.  
  • 15.
  • 16. Progressive Lens Design - Optics Distance Zone Near Zone Umbilical line Intermediate Zone Lens Radius Changes Along Umbilical Line
  • 17.
  • 18.
  • 19. Progressive Lens Design 2. Hard Vs Soft Lens Design Hard Soft
  • 20.
  • 21.
  • 22.
  • 23. Width of Far V ision (+4mm): 0.5 [D]- 16.2 mm 1.0 [D]- Unlimited Max Cylinder [D]- Nasal: 1.5[D] Max Cylinder [D]- Temporal: 1.5 [D] Width of Corridor (-6mm): 1.0[D]- 9 mm Length of corridor: 14.2 mm Minimum fitting: 19 mm Width of near Vision (-18 mm): 1.0[D]- 21.63 mm Soft Design
  • 24.
  • 25.
  • 26.
  • 27.
  • 28.
  • 29. Progressive Lens Design 3. Symmetrical Vs Asymmetrical Symmetrical PAL - same lens design is rotated to fit the other eye Asymmetrical PAL - each eye has a different lens
  • 30.
  • 31.
  • 32.
  • 33.
  • 34.
  • 35.
  • 36.  
  • 37.
  • 38.
  • 39.
  • 40.
  • 41.
  • 42.
  • 43.
  • 44.
  • 45.
  • 46.
  • 47.
  • 48. Computer lens 12 mm power transition zone Access uses a unique aspheric surface: Upper portion for mid-range distances Lower portion has reading Rx Power varies smoothly from top to bottom Mid-range Near
  • 49.
  • 50. mc compared to Adult Progressive Lenses Addition Power Plot mc Myopia Control Standard Adult Progressive Short Corridor Adult Progressive
  • 52. R1 Far Zone Rn Progressive Zone R2 Near Zone Controlling the distortion is the key to the ultimate progressive lens Topographic Map Minimizing Distortions
  • 53. The technology that enables us to design progressive lenses through an exact simulation of the natural human eye view. Eye Point Technology
  • 54. The optical power is created by 3 parameters: thickness, index and curvatures The surface of the lens is scanned by a 3D measuring system, mapping the curvatures of the lens. Eye Point Technology
  • 55.
  • 57. Panamic Panamic Rodenstock Life 2 Hoya GP Wide Zeiss Gradal Top Sola Max Analyzed by Rotlex Class I on a random lens Panorama Gold Comparison
  • 58. Rodenstaik life II Sola Max Sola Max Panamic Rodenstock Life 2 Hoya GP Wide Zeiss Gradal Top Comparison
  • 60. Hoya GP Wide Hoya GP Wide Panamic Rodenstock Life 2 Zeiss Gradal Top Sola Max Zeiss gradal top Comparison

Hinweis der Redaktion

  1. Physiological Considerations
  2. Usable Field of View
  3. Binocular Vision
  4. Peripheral (Extra-Foveal) Vision
  5. Advantages
  6. Advantages
  7. The Optics of Progressive Lenses
  8. Hard vs Soft Design
  9. Asymmetrical Design
  10. Differentiate one design from another.