Scientific measurement protocols 1

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This document outlines scientific measurement protocols for various types of eyewear, including single vision, bifocal, and progressive lenses. It discusses important measurements like interpupillary distance, fitting height, lens centration, and frame adjustments. Proper protocols are described for patient selection, frame fitting, lens marking, quality checks, and delivering instructions to ensure accurate eyewear prescriptions. Following standardized procedures helps optical professionals provide patients with well-fitted lenses that optimize their vision.

Health & Medicine

Churawan Lal sahu
M Optom
1Churawan Lal Sahu M Optom

Measurements
 Single vision
 Bifocals
 Progressive lenses
Scientific Measurement Protocols
2Churawan Lal Sahu M Optom

Single Vision
 IPD
 Centration
Scientific Measurement Protocols
3Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Effect of decentration
4Churawan Lal Sahu M Optom

Bifocals
 IPD
 Distance & Near
 Segment insertion
 Segment height
Scientific Measurement Protocols
5Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Near PD & Segment insertion
6Churawan Lal Sahu M Optom

Segment height
Scientific Measurement Protocols
7Churawan Lal Sahu M Optom

Progressive lenses
 Training
 Communication and counselling
 Convincing power
 Designs knowledge
Scientific Measurement Protocols
8Churawan Lal Sahu M Optom

Progressive lenses
 Possible causes of problems with PAL’s
 Indications
 Contraindications
Scientific Measurement Protocols
9Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Fields of view Direction of Gaze
Contraindications
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 Mobility / Head Movement
Scientific Measurement Protocols
Contraindications
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Contraindications
 Anisometropia
 High Cylinders
 Prisms
 High ADD
Scientific Measurement Protocols
12Churawan Lal Sahu M Optom

Contraindications
 Bifocal users
 Reading glasses users
Scientific Measurement Protocols
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Scientific Measurement Protocols
Measurements step by steps
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Step 1
Patients selection
Scientific Measurement Protocols
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Patients selection
 Identification
 Requirements
 Expectations
Scientific Measurement Protocols
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Step 2
Frame selection
Scientific Measurement Protocols
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Scientific Measurement Protocols
Frame shape
Good Shape
Bad Shape
Good Depth Good Size
Too Large
Frame sizeFrame depth
Small frame 18Churawan Lal Sahu M Optom

Ideal frames
 Prefer metal frames
 Adjustable nose pads
 Min depth of 25-30 mm
 Min fitting height should be 18mm / 14mm
Scientific Measurement Protocols
19Churawan Lal Sahu M Optom

Step 3
Frame Adjustment
Scientific Measurement Protocols
20Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Frame Adjustment
 Vertex distance
 Pantoscopic tilt
 Facial wrap
21Churawan Lal Sahu M Optom

Back vertex distance
 Shorter
 Reduce BVD – wider fields of view
Scientific Measurement Protocols
22Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Effect of vertex distance
23Churawan Lal Sahu M Optom

Pantoscopic tilt
 10 to 12 degree
 Pantoscopic tilt – increases near field of view
Scientific Measurement Protocols
24Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Effect of Pantoscopic tilt
25Churawan Lal Sahu M Optom

Facial wrap – must not be too flat
Scientific Measurement Protocols
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Scientific Measurement Protocols
Effect of facial wrap
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Step 4
Interpupillary distance (IPD)
Scientific Measurement Protocols
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IPD
 Monocular PD
 Binocular PD
 Scale or Pupillometer
Scientific Measurement Protocols
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IPD
 Use a corneal reflex for accuracy
 In case of strabismus – occlude one eye
Scientific Measurement Protocols
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Pupillometer centration
Scientific Measurement Protocols
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Effect of inexact IPD marking
Scientific Measurement Protocols
32Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Step 5
Monocular PD marking in the lens
33Churawan Lal Sahu M Optom

Step 6
Fitting Height/ Vertical Height
Scientific Measurement Protocols
34Churawan Lal Sahu M Optom

Fitting Height
 Ensure that you are at eye level of patients
 Take monocular fitting height
 Measure directly to pupil centre
 Ensure that patient is looking strait ahead
Scientific Measurement Protocols
35Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Fitting height
36Churawan Lal Sahu M Optom

Effect of wearer posture
Scientific Measurement Protocols
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Scientific Measurement Protocols
Effect of parallax error
 Parallax error can significantly affect fitting
height
38Churawan Lal Sahu M Optom

Effect of Fudging Fitting Height
Scientific Measurement Protocols
39Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Step7
Check the lens cut out
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Scientific Measurement Protocols
Delivery ..
Quality check up
 Markings
 Frame alignments
 Power
 Fitting cross heights & PDs
41Churawan Lal Sahu M Optom

Scientific Measurement Protocols
Delivery ..
On eye assessment
Frame fit Fitting crosses 42Churawan Lal Sahu M Optom

Delivery
Scientific Measurement Protocols
Delivery Instructions
43Churawan Lal Sahu M Optom

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Scientific measurement protocols 1

1. Churawan Lal sahu M Optom 1Churawan Lal Sahu M Optom

2. Measurements  Single vision  Bifocals  Progressive lenses Scientific Measurement Protocols 2Churawan Lal Sahu M Optom

3. Single Vision  IPD  Centration Scientific Measurement Protocols 3Churawan Lal Sahu M Optom

4. Scientific Measurement Protocols Effect of decentration 4Churawan Lal Sahu M Optom

5. Bifocals  IPD  Distance & Near  Segment insertion  Segment height Scientific Measurement Protocols 5Churawan Lal Sahu M Optom

6. Scientific Measurement Protocols Near PD & Segment insertion 6Churawan Lal Sahu M Optom

7. Segment height Scientific Measurement Protocols 7Churawan Lal Sahu M Optom

8. Progressive lenses  Training  Communication and counselling  Convincing power  Designs knowledge Scientific Measurement Protocols 8Churawan Lal Sahu M Optom

9. Progressive lenses  Possible causes of problems with PAL’s  Indications  Contraindications Scientific Measurement Protocols 9Churawan Lal Sahu M Optom

10. Scientific Measurement Protocols Fields of view Direction of Gaze Contraindications 10Churawan Lal Sahu M Optom

11.  Mobility / Head Movement Scientific Measurement Protocols Contraindications 11Churawan Lal Sahu M Optom

12. Contraindications  Anisometropia  High Cylinders  Prisms  High ADD Scientific Measurement Protocols 12Churawan Lal Sahu M Optom

13. Contraindications  Bifocal users  Reading glasses users Scientific Measurement Protocols 13Churawan Lal Sahu M Optom

14. Scientific Measurement Protocols Measurements step by steps 14Churawan Lal Sahu M Optom

15. Step 1 Patients selection Scientific Measurement Protocols 15Churawan Lal Sahu M Optom

16. Patients selection  Identification  Requirements  Expectations Scientific Measurement Protocols 16Churawan Lal Sahu M Optom

17. Step 2 Frame selection Scientific Measurement Protocols 17Churawan Lal Sahu M Optom

18. Scientific Measurement Protocols Frame shape Good Shape Bad Shape Good Depth Good Size Too Large Frame sizeFrame depth Small frame 18Churawan Lal Sahu M Optom

19. Ideal frames  Prefer metal frames  Adjustable nose pads  Min depth of 25-30 mm  Min fitting height should be 18mm / 14mm Scientific Measurement Protocols 19Churawan Lal Sahu M Optom

20. Step 3 Frame Adjustment Scientific Measurement Protocols 20Churawan Lal Sahu M Optom

21. Scientific Measurement Protocols Frame Adjustment  Vertex distance  Pantoscopic tilt  Facial wrap 21Churawan Lal Sahu M Optom

22. Back vertex distance  Shorter  Reduce BVD – wider fields of view Scientific Measurement Protocols 22Churawan Lal Sahu M Optom

23. Scientific Measurement Protocols Effect of vertex distance 23Churawan Lal Sahu M Optom

24. Pantoscopic tilt  10 to 12 degree  Pantoscopic tilt – increases near field of view Scientific Measurement Protocols 24Churawan Lal Sahu M Optom

25. Scientific Measurement Protocols Effect of Pantoscopic tilt 25Churawan Lal Sahu M Optom

26. Facial wrap – must not be too flat Scientific Measurement Protocols 26Churawan Lal Sahu M Optom

27. Scientific Measurement Protocols Effect of facial wrap 27Churawan Lal Sahu M Optom

28. Step 4 Interpupillary distance (IPD) Scientific Measurement Protocols 28Churawan Lal Sahu M Optom

29. IPD  Monocular PD  Binocular PD  Scale or Pupillometer Scientific Measurement Protocols 29Churawan Lal Sahu M Optom

30. IPD  Use a corneal reflex for accuracy  In case of strabismus – occlude one eye Scientific Measurement Protocols 30Churawan Lal Sahu M Optom

31. Pupillometer centration Scientific Measurement Protocols 31Churawan Lal Sahu M Optom

32. Effect of inexact IPD marking Scientific Measurement Protocols 32Churawan Lal Sahu M Optom

33. Scientific Measurement Protocols Step 5 Monocular PD marking in the lens 33Churawan Lal Sahu M Optom

34. Step 6 Fitting Height/ Vertical Height Scientific Measurement Protocols 34Churawan Lal Sahu M Optom

35. Fitting Height  Ensure that you are at eye level of patients  Take monocular fitting height  Measure directly to pupil centre  Ensure that patient is looking strait ahead Scientific Measurement Protocols 35Churawan Lal Sahu M Optom

36. Scientific Measurement Protocols Fitting height 36Churawan Lal Sahu M Optom

37. Effect of wearer posture Scientific Measurement Protocols 37Churawan Lal Sahu M Optom

38. Scientific Measurement Protocols Effect of parallax error  Parallax error can significantly affect fitting height 38Churawan Lal Sahu M Optom

39. Effect of Fudging Fitting Height Scientific Measurement Protocols 39Churawan Lal Sahu M Optom

40. Scientific Measurement Protocols Step7 Check the lens cut out 40Churawan Lal Sahu M Optom

41. Scientific Measurement Protocols Delivery .. Quality check up  Markings  Frame alignments  Power  Fitting cross heights & PDs 41Churawan Lal Sahu M Optom

42. Scientific Measurement Protocols Delivery .. On eye assessment Frame fit Fitting crosses 42Churawan Lal Sahu M Optom

43. Delivery Scientific Measurement Protocols Delivery Instructions 43Churawan Lal Sahu M Optom

44. Thank you 44Churawan Lal Sahu M Optom

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