CLT Light Therapy Equipment & Technology 2

Question 1

Why is it important to calibrate a light therapy device regularly?

Accepted Answer

To ensure accurate, consistent fluence delivery as output can degrade over the device's lifespan

Answer

Light-emitting components degrade over time, and regular calibration with a power meter ensures that actual output matches the intended therapeutic dose.

Question 2

What is the function of a bandpass filter in a light therapy device?

Accepted Answer

To transmit only a selected range of wavelengths while blocking others

Answer

Bandpass filters allow only specific wavelength ranges to pass through, enabling targeted chromophore activation by excluding non-therapeutic wavelengths.

Question 3

What does the term 'pulse duration' (pulse width) refer to in laser or IPL settings?

Accepted Answer

The length of time the device emits light during a single pulse, typically measured in milliseconds

Answer

Pulse duration determines how long tissue is exposed to energy in each burst, and matching pulse duration to target thermal relaxation time prevents non-target tissue damage.

Question 4

Which safety device is mandatory for all personnel present during Class III and IV laser treatments?

Accepted Answer

Wavelength-specific protective eyewear (laser safety glasses/goggles)

Answer

Laser safety eyewear calibrated to the specific wavelength in use protects eyes from retinal and corneal injury, which can occur from even brief direct or scattered beam exposure.

Question 5

What is 'selective photothermolysis' as it applies to laser and light therapy?

Accepted Answer

Using specific wavelengths to selectively heat and destroy a target chromophore without damaging surrounding tissue

Answer

Selective photothermolysis (Anderson & Parrish, 1983) is the principle of matching wavelength, pulse duration, and fluence to selectively heat a target (e.g., melanin, hemoglobin) while sparing surrounding structures.

CLT - Certified Light Therapist Practice Test

CLT - Certified Light Therapist Practice Test

CLT Light Therapy Equipment & Technology 2