Occupational Optics & Workplace Vision
• 10 min read
Welders & Metal Fabrication: Optical Radiation, Infrared Hazards & Shade Selection
EXECUTIVE CLINICAL SUMMARY
An industrial electric welding arc burns at over 5,000°C, generating an intense plasma plume that emits violent electromagnetic radiation spanning ultraviolet (UV), blinding visible light, and invisible near-infrared (IR). We break down the clinical pathology of Photokeratitis (Arc Eye), thermal Infrared cataracts, and the exact ANSI Z87.1 Shade Number equations.
ELLASUV Clinical Metrology Laboratory
Industrial Ophthalmic Safety & Radiometry Division
ISO 8980-3 / ANSI Z80.1 Metrology
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Updated: 2026-09-07
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✓ Peer-Reviewed
The Three Optical Killers of the Electric Welding Arc
When striking an arc in MIG, TIG, or Stick welding, the electric discharge produces three distinct destructive wavebands:
- Ultraviolet Radiation (200nm – 380nm): High-energy actinic UV strikes the superficial corneal epithelium, denaturing cellular nuclear DNA within seconds. 6 to 12 hours later, dead epithelial cells slough off, exposing raw corneal nerve endings. This agonizing condition is clinically termed Photokeratitis (popularly known as Welder's Flash or Arc Eye).
- Intense Visible Luminance (380nm – 780nm): Exceeds 10,000,000 candelas per square meter, instantly bleaching retinal photopigments and causing permanent central scotomas.
- Infrared Radiation (780nm – 3,000nm): Invisible thermal radiation penetrates deep into the ocular media, absorbed by the iris and crystalline lens. Over years, chronic thermal heating denatures crystallin proteins, producing Glassblower's / Welder's Cataracts.
The Mathematical Physics of Welding Shade Numbers ()
Under international standard ANSI Z87.1 and ISO 4850, the optical density and luminous transmittance () of a welding filter are governed by the logarithmic Shade Equation:
For example, a Shade 10 lens transmits only 0.00139% of visible light, while completely extinguishing 99.999% of ultraviolet and infrared radiation.
ANSI Z87.1 Shade Selector Matrix by Welding Process
| Welding Operation / Process | Current Arc Amperage | Minimum Protective Shade | Prescription Eyewear Protocol |
|---|---|---|---|
| Torch Brazing & Soldering | Gas flame | Shade 3 – 4 | Prescription safety glasses with IR-absorbing green dye |
| Oxy-Fuel Gas Cutting | Heavy plate (> 1 inch) | Shade 5 – 6 | Side-shield prescription goggles |
| Shielded Metal Arc (Stick) | 75 – 250 Amps | Shade 10 – 12 | Prescription insert or safety glasses worn beneath full helmet |
| Gas Tungsten Arc (TIG) | 50 – 250 Amps | Shade 11 – 13 | Fast-switching auto-darkening helmet + ANSI Z87+ spectacles |
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FREQUENTLY ASKED CLINICAL QUESTIONS
Expert Answers
What is welder's flash (arc eye) and how is it treated? ▼
Welder's flash is severe corneal sunburn caused by exposure to intense ultraviolet radiation from a welding arc. Treatment includes antibiotic lubricating ointments, cycloplegic drops to relieve ciliary spasm, and dark rest; the corneal epithelium typically regenerates within 24 to 48 hours.
Can I wear contact lenses while welding? ▼
Yes. The old urban legend that welding arcs melt contact lenses to the cornea is completely false. However, flying dust and sparks in fabrication shops can cause foreign-body corneal abrasions, so certified safety glasses must always be worn.
Do auto-darkening helmets protect against UV when they are clear? ▼
Yes. High-quality auto-darkening helmets have a permanent internal UV/IR interference filter that provides continuous 100% protection up to Shade 13, even when the electronic LCD filter is in its light state (Shade 3).
Can infrared radiation from furnaces and glassblowing cause cataracts? ▼
Yes. Chronic exposure to infrared heat without protective reflective or absorbing lenses cooks the crystallin proteins in the lens, causing posterior subcapsular 'glassblower's cataracts'.
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