UK National Aerospace NDT Board Near Vision Requirements Presentation complied by UK NANDTB 1 NAndtB_20 Issue 2 2010-04-15 © UK NANDTB.

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UK National Aerospace NDT Board Near Vision Requirements Presentation complied by UK NANDTB 1 NAndtB_20 Issue © UK NANDTB

UK National Aerospace NDT Board Background  EN4179:2005 required near vision acuity to Jaeger No. 1 or equivalent, not less than 30cm/12 in in at least one eye, natural or corrected.  Vision acuity in EN4179:2009 changed to 20/25 (Snellen) at 16” (42cm) +/- 1” (2.54cm) or equivalent in at least one eye, natural or corrected.  There are methods other than Snellen for examining near vision eyesight acuity and there is considerable debate even within the medical field as to “equivalency” of vision requirements.  Responsible Level 3’s will find it difficult to obtain clearly defined supporting medical evidence regarding the equivalency of vision requirements.  The numerous potential avenues for equivalency provides scope for variation and error. NAndtB_20 Issue © UK NANDTB

UK National Aerospace NDT Board Compliance NAndtB_20 Issue EN4179/NAS410 ‘Sans Serif’ font Acceptable Equivalents ≥12” ≥16” FAA Other ‘Snellen’ 16” charts Sloan Characters Point Chart Jaeger Chart 20/25 16” +/- 1” FAA Other ‘Snellen’ 16” charts Potential Others Distance reading standards Not suitable for near vision ISO8596 (2009) BS (2003) © UK NANDTB

UK National Aerospace NDT Board Global Standard  An agreed global standard for NDT personnel would eliminate the problems of variation and mitigate the risk of error. A standardised solution is required taking the following essential attributes in to consideration:  Optotype  Optotype size based upon 5 minutes of arc  Optotype spacing  Eye to optotype distance  Illumination  Acceptance criteria  Use of both eyes (as used for inspection) NAndtB_20 Issue © UK NANDTB

UK National Aerospace NDT Board UK NANDTB Policy Single Option: - Visual acuity tests to be carried out: Using the UK NANDTB chart and NANDTB/20 Using the actual eye-wear used in the inspection process – Note: This includes corrective lenses and/or eye protection as normally used. “Equivalents” not permitted within UK jurisdiction Existing certification valid until expiration Responsible Level 3 accountable for training and delegations Note: No Medical/Optical alternative test permitted (eg Optometrist Standard tests) Functional NEAR VISION Acuity Test Not for colour vision Not medical examination – Employers should consider this separately – as for VDU operators etc NAndtB_20 Issue © UK NANDTB

UK National Aerospace NDT Board The Test Chart NAndtB_20 Issue © UK NANDTB

UK National Aerospace NDT Board Test Procedure NAndtB_20 Issue OUTLINE: 1)Train/delegate personnel who will administer test 2)Download/Print Chart and verify quality – keep secure 3)Use one block of “E”s - better quality block 4)Verify illumination level 5)Ensure normal eyewear is used 6)Set distance 400±25mm 7)Establish the responses to be used 8)Administer test – candidate using both eyes together 9)Start at Line 1 working left to right and moving down lines 10)Acceptance Level is 5 out of 5 up to & including line 9 © UK NANDTB

UK National Aerospace NDT Board ADVANTAGES NAndtB_20 Issue  Is Universal - No language/alphabet dependency  Based on vision acuity – not reading ability  Based on resolution of 6 mins of arc - as 20/25 Snellen  Can be administered locally  Directly controlled by Responsible Level 3  Basically “fail safe”  Administered under defined conditions  Auditable  Based on accepted scientific principles (eg BS , ISO 8596)  Can be carried out in inspection area  May be carried out in conjunction with annual appraisal © UK NANDTB