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Vision Screening Why? Tools of the trade

Vision Screening Why? Tools of the trade. Law Vehicles (cars & heavy duty) Regulation 102 of the National Road Traffic Act (93 of 1996) Driven machinery Driven machinery regulations (Feb 2005) of the Occupational Health & Safety Act. Why?. 2. Employee productivity

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Vision Screening Why? Tools of the trade

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  1. Vision Screening • Why? • Tools of the trade

  2. Law Vehicles (cars & heavy duty) Regulation 102 of the National Road Traffic Act (93 of 1996) Driven machinery Driven machinery regulations (Feb 2005) of the Occupational Health & Safety Act Why?

  3. 2. Employee productivity Clear & comfortable vision Headaches, neck aches Why?

  4. Regulation 102 of the National Road Traffic Act (93 of 1996) Minimum visual acuity • Codes A1 to EB (light vehicles): • 6/12 in each eye • One eye worse than 6/12, other 6/9 or better • Codes EC & EC1 (heavy duty vehicles): • 6/9 in each eye • One eye worse than 6/9, too bad…

  5. Regulation 102 of the National Road Traffic Act (93 of 1996) Minimum visual fields • Codes A1 to EB (light vehicles): • 70° temporal each eye • One eye < 70°, at least 115° total horizontal field (both eyes together) • Codes EC & EC1 (heavy duty vehicles): • 70° temporal each eye • One eye < 70°, too bad…

  6. Same as for codes EC & EC1 (heavy duty) 6/9 each eye 70° temporal visual field each eye PLUS Stereopsis (3-D vision) Existing PDP Same as codes EC & EC1 (no stereopsis required!) Driven machinery regulations

  7. Tools of the Trade

  8. All-in-one vision screeners Keystone vision screener Keystone Telebinocular

  9. All-in-one vision screeners • Pro’s • Visual acuity (far & near) • Stereopsis • Colour vision • Muscle balance

  10. Cons Patient observation more difficult, eg. squinting or viewing through incorrect part of spectacles Stereopsis test difficult to explain Proximal accommodation All-in-one vision screeners

  11. Visual acuity Snellen chart 1800’s – stood test of time Wall chart Chart projector Tools of the trade

  12. Snellen chart • Correct use!! • Test distance • see ‘Eye Care Topics → Visual Acuity’ on www.occuvision.com • Gentle eye cover • Watch person for cheating

  13. Colour vision • Ishihara plates • Simple

  14. Colour vision Farnsworth D-15 Good adjunct to Ishihara

  15. Stereopsis Randot stereotest NB presbyopes to wear near vision correction

  16. Refractive state of eye Keratometry Measures basic corneal curvature Autorefractor

  17. Non-contact tonometer • Intra-ocular pressure • Glaucoma • Peripheral field loss

  18. Thank you

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