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Blue light and eye
- 1. BLUE LIGHT &CVS - - BY NEHA MAURYA & PAYAL SANGANI (3rd Yr. B.Optom)
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- 7. WHAT IS CVS...?? AOA: Computer vision syndrome (CVS), also called digital eye strain, is a group of eye- and vision-related problems that result from prolonged digital screen use.
- 8. NIOSH : ●According tothe National Institute of Occupational Safety and Health, CVS affects up to 90% of the people who spend 3 hours or more a day at a computer.
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- 11. WHY ? BLURRED VISION -dirty screen - poor viewing angle - reflected glare - poor quality / defective monitor
- 12. ●Lag of accomodation ●Transientmyopia (Squinting) ●Glare image ●squinting EYE RELATED:
- 13. Headaches Visual headaches - Towardthe front or sides of the head - Occur on one side of the head - Occur most often middle or end of the day - Time of onset - Location of the pain - Frquency, duration, severity - Precipating factors & associated sign&symptoms Visual & Environmental condition
- 14. Neck & Backpain “the eyes lead the body” Ex. Computer users, alternate their viewing gaze between the keybord & the screen
- 15. Dry & IrritatedEyes ●Decreased blink rate ●Air environment
- 16. Light Sensitivity - Glare: discomfort & reflective -higher luminance - overhead flourescent fixture -bright open windows - dark background display screen - other source : white paper on the desk light coloured desk surface desk lamps directed toward the eyes
- 17. DOUBLE VISION - RPA&RPC Eye Strain After – image & color distortion
- 18. HOW TO DIAGNOSE? ●Patient H/o ●VA measurements & Refraction ●Bincular vision testing . how the eyes focus,move & work together
- 19. TO REDUCE HAZARDOF BLUE LIGHT or TO REDUCE SYMPTOMS OF CVS
- 20. REDUCE GLARE ●Direct theoverhead lights away from computer screen ●Screen position : windows are to the side rather than back or front ●Wall should be painted little darker in color ●Installn anti-glare coated glass on screen ●Use anti-glare glasses (ARC)
- 21. Computer display ●Increase fontsize ●Screen brigthness should adjusted according background brightness . (Auto-brightness mode) ●Clean your screen
- 22. ●REFRENCE MATERIAL LOCATION Closeto the computer screen ●USE LUBRICATING EYEDROPS ●BLINK MORE OFTEN . Blink everytime you hit the . Enter KEY OR MOUSE CLICK ●COMPUTER LENS DESIGNS . PALs
- 23. Sitting posture ●At comfortableviewin distance for you . (no closer than reading distance to arm length) Computer set up ergonomics -.monitor hight : top of monitor – just beneath eye level with the bottom of the monitor tilted in toward you . - monitor distance – 2 feet away from you . - keybord – should be angled to allow wrist straight with support . - chair height – should allow your lower arm to extend at the elobow straight ahead,so angle btwn upper & lower arm is 90°
- 25. ●20-20-20 RULE ●LIMIT THEAMOUNT OF SCREEN TIME ●AVOID AIR DRAFTS Avoid sitting in front of an AC facing
- 26. EXERCISE TO PREVENTCVS ●Exercise done when sitting In the computer chair
- 27. Summary ●Prolonged exposure tocomputers is not healthy for human optical system ●If CVS symptoms are not treated, they can have a real effect on your work performance ●Lowered productivity ●Increased error rate ●Reduced job satisfaction ●Steps should be taken to reduce ocular discomfort in the workplace
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