What does ANSI Z87.1 mean on safety glasses?

ANSI Z87.1 is the American National Standards Institute standard for occupational and educational eye and face protection. When you see Z87 marked on safety glasses, it means both the frame and lenses have been tested and certified to meet specific impact resistance, coverage, and optical quality requirements. Z87+ indicates the higher level of protection (high-impact rated).

What is the best lens material for safety glasses?

Polycarbonate and Trivex are the two primary lens materials for safety glasses. Polycarbonate is the most widely used due to its excellent impact resistance, lightweight, built-in UV protection, and cost-effectiveness. Trivex offers slightly better optical clarity (higher Abbe value) and lighter weight, making it preferred for patients with higher prescriptions who notice chromatic aberration with polycarbonate.

Can I use regular glasses as safety glasses?

No. Regular eyeglasses do not meet ANSI Z87.1 safety standards even if they use polycarbonate lenses. Safety glasses require both frames and lenses to be specifically rated and marked with the Z87 designation. Regular frames are not designed to withstand impact testing, and regular lenses may not meet the minimum thickness requirements. Using regular glasses in place of safety eyewear creates significant injury risk.

Do safety glasses need side shields?

For most industrial applications, yes. Side shields protect against hazards approaching from the sides, such as flying debris or chemical splashes. Side shields may be permanently integrated into the frame design or removable clip-on attachments. The specific workplace hazard assessment determines whether side shields are required.

Safety Eyewear Products: ANSI Z87.1 Standards, Materials, and Selection

Why Safety Eyewear Matters

Safety eyewear protects the eyes from physical, chemical, and environmental hazards. Eye injuries are among the most preventable workplace injuries, yet they remain common. As a dispensing optician, understanding safety eyewear standards and products ensures you can properly fit and recommend protective eyewear that meets regulatory requirements.

ANSI Z87.1 Standard

The ANSI Z87.1 standard, published by the American National Standards Institute, establishes performance criteria for eye and face protection devices. This is the primary standard tested on the ABO exam. Key requirements include:

Impact resistance: Both frames and lenses must pass impact testing
Coverage: Adequate coverage for the intended hazard type
Marking: All compliant products must carry the Z87 mark
Optical quality: Lenses must meet minimum optical standards

The standard defines two levels of impact protection:

Level	Test	Marking	Application
Basic impact	1" steel ball drop test	Z87	General protection
High impact	1/4" steel ball at high velocity	Z87+	High-risk environments

Both the frame AND the lenses must be Z87.1 rated for the eyewear to be compliant. A Z87-rated lens in a fashion frame, or a Z87-rated frame with standard lenses, does NOT meet the standard. Look for Z87 markings on both components.

Safety Lens Materials

Polycarbonate

Polycarbonate is the most widely used safety lens material. It inherently meets the impact resistance requirements of ANSI Z87.1 in standard thicknesses (2.0 mm minimum for dress safety, 3.0 mm for industrial). Polycarbonate properties:

Exceptional impact resistance (nearly unbreakable under normal conditions)
Lightweight (specific gravity 1.20)
Built-in UV protection (blocks 99.9% of UV)
Thinner than standard plastic at the same power
Requires scratch-resistant coating (soft surface)

Trivex

Trivex offers comparable impact resistance to polycarbonate with some additional benefits:

Superior optical clarity (lower chromatic aberration)
Lighter than polycarbonate (specific gravity 1.11)
More scratch-resistant than uncoated polycarbonate
Chemical resistance for lab environments
Higher Abbe value (43-45 vs 30 for polycarbonate), meaning less color fringing

For patients who require safety eyewear and have high prescriptions, Trivex often provides better optical quality than polycarbonate because of its higher Abbe value. Polycarbonate's low Abbe value (30) can cause noticeable chromatic aberration in higher powers, while Trivex (Abbe 43-45) is significantly clearer.

Frame Requirements

Safety frames must meet specific requirements beyond standard dress eyewear:

Frame thickness and strength: Safety frames are thicker and more impact-resistant than fashion frames
Side shields: Required for most industrial applications to protect against lateral hazards (flying debris, splashes)
Retention: Frames must hold lenses securely under impact without the lens dislodging
Marking: The manufacturer's logo and Z87 marking must be present on the frame

Side shields may be permanent (integral to the frame design) or removable (clip-on). Permanent side shields provide better protection and are preferred for high-hazard environments.

Types of Safety Eyewear

Industrial Safety Eyewear

Industrial safety eyewear is designed for workplace hazards including:

Flying particles (grinding, drilling, machining)
Chemical splashes (laboratory work, cleaning)
Dust and debris
Optical radiation (welding, laser work)

Industrial safety eyewear often requires high-impact (Z87+) rating and may include additional features like sealed gaskets, ventilation systems, and specialty tints for specific tasks.

Sports Safety Eyewear

Sports safety eyewear protects against impact from balls, racquets, elbows, and other hazards during athletic activities. Features include:

Secure fit with adjustable straps or wrap-around temple designs
Anti-fog coatings for active use
Ventilation to reduce fogging during exertion
Padding at contact points for comfort during movement

The ASTM F803 standard applies specifically to sports protective eyewear for racquet sports, basketball, and other activities. This is a different standard from ANSI Z87.1 and applies specifically to recreational sports eye protection.

Assuming that all impact-resistant lenses are safety-rated. Standard polycarbonate dress lenses pass the FDA drop-ball test but may not meet ANSI Z87.1 thickness requirements. Safety lenses must be at least 2.0 mm thick (dress safety) or 3.0 mm thick (industrial) to qualify. Always verify the Z87 marking.

Prescription Safety Eyewear

Patients who need vision correction and eye protection have several options:

Prescription safety glasses: Custom-made with the patient's Rx in safety-rated frames and lenses
Over-the-glass (OTG) goggles: Large enough to fit over the patient's regular eyeglasses
Safety inserts: Prescription inserts that clip inside non-prescription safety goggles

Prescription safety glasses are the most popular choice because they provide the best fit, comfort, and optical quality for extended wear.

Selecting and Verifying Safety Eyewear

When dispensing safety eyewear, verify the following before delivery:

Z87 (or Z87+) marking on both frame and lenses
Proper fit with side shields where required
Correct prescription verification (standard lensometry)
Scratch-resistant coating on polycarbonate lenses
Patient education on proper use, cleaning, and replacement schedule

Clinical Relevance

Employers often require documented proof that safety eyewear meets ANSI Z87.1. Dispensing non-compliant eyewear creates liability for both the optical professional and the employer. Beyond regulatory compliance, proper safety eyewear prevents sight-threatening injuries that can permanently affect a patient's quality of life.

Key Takeaways

ANSI Z87.1 is the governing standard for safety eyewear in the United States
Both frames and lenses must carry the Z87 marking for the eyewear to be compliant
Polycarbonate and Trivex are the primary safety lens materials
Z87 indicates basic impact; Z87+ indicates high-impact protection
Side shields are required for most industrial applications
ASTM F803 is the specific standard for sports protective eyewear
Safety lenses have minimum thickness requirements beyond standard dress eyewear