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Visual display unit
This document discusses potential health hazards from prolonged visual display unit (VDU) use, including asthenopia (eye strain), dermatitis, epilepsy, and radiation. Asthenopia is a very common complaint, experienced by 40% of VDU operators, and can be caused by ocular issues, personal factors like stress or migraine, and workstation design problems such as glare, lighting, and color contrast. Proper workstation setup and regular breaks can help prevent asthenopia and other health issues associated with extensive VDU use.
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Millions use VDUs; possible health hazards include asthenopia, dermatitis, epilepsy, and radiation.
Asthenopia is a common issue, affecting 40% of VDU users, caused by ocular, personal, workstation, and environmental factors.
Ocular issues like refractive errors and convergence insufficiency increase myopia risk, contributing to asthenopia.
Physical (fatigue, health issues) and psychological factors (stress, anxiety) contribute to asthenopia symptoms.
Workstation design elements, including lighting and glare, as well as alpha numeric display legibility, affect VDU use. Solutions like filter panels and anti-reflection coatings can reduce screen reflections and improve environmental conditions.
Asthenopia symptoms range from ocular and visual issues to headaches and behavioral changes affecting daily function.
Visual standards for VDU operators include 6/6 reading ability and normal convergence, ensuring optimal vision health.
Facial rashes from dust buildup on VDUs; prevention includes cleaning and physical barriers like glass sheets.
Photosensitive epilepsy is rare; mitigation strategies include reducing screen brightness and using tinted eyewear.
VDUs emit low levels of UV and IR radiation; studies confirm they are not considered health hazards.
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Visual display unit
- 2. VISUAL DISPLAY UNITS Millions of people of all ages now use VDU Possible health hazards Use of VDU that may affect the eyes Asthenopia Facial rash/ dermatitis Epilepsy Radiation
- 3. ASTHENOPIA Caused by convergence& accommodation difficulties Very common complaint among VDU users 40% VDU operators suffer from asthenopic symptoms
- 4. ASTHENOPIA SYMPTOMS DUE TO Ocular status Personal factors Workstation factors Environmental factors
- 5. OCULAR STATUS Minorrefractive error Astigmatism Convergence insufficiency More likely to develop myopia
- 6. PERSONAL FACTORS Generalfatigue Ill health Migraine } -physiological factors photophobia Anxious Stress } –psychological factors
- 7. WORKSTATION DESIGN Lightning Glare Colour contrast Alpha numeric design
- 8. LIGHTNING Correct levelof illumination Using up lighters – reduce glare - reflection
- 9. GLARE Caused bybright sources of light Light from window or artificial light
- 10. Reduce Position ofVDU screen should be adjusted VDU contrast & brightness control Windows be fitted
- 11. Eliminate screen reflections Filter panel Anti reflection coatings Colour contrast Colour of phosphors used for VDUs varies
- 12. ALPHA NUMERIC DISPLAY Visible Legible readable
- 13. ENVIRONMENTAL CONDITION Glarefree Involuntary relief of eyes occurs by looking away the distant object Noisy equipment should be positioned away from the operator Adequate ventilation Reasonable humidity
- 14. SYMPTOMS OF ASTHENOPIA Ocular symptoms Visual symptoms Systemic symptoms Functional symptoms
- 15. OCULAR SYMPTOMS Sore Tired Itching Dryness Burning Aching
- 16. VISUAL SYMPTOMS Focusingproblem Blurred vision Double vision Fixation problem
- 17. SYSTEMIC SYMPTOMS Headache tiredness
- 18.
- 19. VISUAL STANDARDS Abilityto read 6/6 Ability to read n6 at 33-75 cm Well established monocular vision Well established binocular vision Near point of convergence is normal Clear ocular media
- 20. FACIAL RASH/DERMATITIS Electricbeam of VDU attracts of dust particles forming dusty layer Facial rashes common among VDU operators Complaints may be itching of the skin, reddening It occurs usually couple of hours & disappear
- 21. To Prevent Glasssheet between the operator & the screen Periodic cleaning of the VDU screen with antistatic solution will control the dust accumulation
- 22. EPILEPSY Some peoplesuffer from epilepsy Rare condition Known as photosensitive epilepsy
- 23. To reduce Reducingthe luminous of the display Covering the screen with tinted Operator should wear tinted spectacle
- 24. RADIATION Radiation emissionfrom the VDU screen –UV, IR Weiss & peterson – 1979 & Elliot 1986 concluded that the measured values of electromagnetic radiation were at below existing limits The radiation emitted from VDU is not considered to be a health hazard.