CLS Laser Safety and ANSI Standards

Question 1

Which ANSI standard is the primary safety standard governing the use of lasers in medical and aesthetic settings in the United States?

Accepted Answer

ANSI Z136.3

Answer

ANSI Z87.1

Answer

ANSI Z136.1

Answer

ANSI Z49.1

Question 2

What is the Nominal Ocular Hazard Distance (NOHD) of a laser?

Accepted Answer

The distance beyond which the laser beam irradiance falls below the maximum permissible exposure for the eye

Answer

The distance at which protective eyewear must be worn by bystanders

Answer

The minimum distance a patient must maintain from the laser aperture

Answer

The distance at which the beam diverges to a 1/e² radius of 1 mm

Question 3

Class 4 lasers, which include most medical and aesthetic lasers, are defined by which characteristic?

Accepted Answer

Output power above 500 mW, capable of causing fire and diffuse reflection hazards

Answer

Output power less than 1 mW, no beam hazard

Answer

Output power 1–5 mW, hazardous for direct viewing only

Answer

Output power between 5 mW and 500 mW, hazardous for direct beam viewing

Question 4

What is the minimum Optical Density (OD) requirement for laser protective eyewear, and what does OD represent?

Accepted Answer

OD 4; reduces transmission by 10,000-fold

Answer

OD 1; reduces transmission by 10-fold

Answer

OD 10; blocks all laser wavelengths

Answer

OD 2; reduces transmission by 100-fold

Question 5

Who is designated as the Laser Safety Officer (LSO) in a medical laser facility, and what is their primary responsibility?

Accepted Answer

A qualified person with authority and responsibility to monitor and enforce laser safety measures

Answer

The equipment manufacturer's service technician, responsible for annual calibration

Answer

The clinic's lead physician, who approves all patient treatment protocols

Answer

An external government inspector who evaluates annual compliance

Question 6

During a laser hair removal procedure, a fire starts on a drape near the treatment area. What is the first priority action?

Accepted Answer

Activate the laser's emergency stop and remove the ignition source

Answer

Evacuate the patient from the room immediately

Answer

Call the fire department before taking any other action

Answer

Continue the treatment to the designated endpoint