Week 3

Question 1

unintended laser irritation can either be…

Answer 1

direct or indirect

Question 2

which are the main organs at risk of injury?

Answer 2

eyes and skin

Question 3

what are the risks associated with the use of lasers?

Answer 3

electrocution, fire, explosive hazards, inhaled contaminants, toxins & contact with chemicals.

Question 4

What does MPE stand for?

Answer 4

Maximum permissible exposure

Question 5

with Visible and near IR 400-1400 nm what is the retina at risk of?

Answer 5

Photo thermal injury

Question 6

What is at risk in the far IR >1400 nm from photo thermal injury?

Answer 6

the lens and cornea

Question 7

what type of injury is caused from visible blue and some green wave lengths

Answer 7

photo chemical injury to the retina

Question 8

what is the retinal hazard region? (in nm)

Answer 8

400 - 1400 nm

Question 9

what is the aversion response?

Answer 9

the ability for an individual to constrict the pupil, squint, turn away or blink the eye, limiting the exposure to the light.

Question 10

what wavelengths will the aversion response work for?

Answer 10

400-750 nm

Question 11

what are the 2 most common types of damage to the skin? (photo…)

Answer 11

photo thermal (burn) and photo chemically induced erythema.

Question 12

At what temperature does the natural aversion response kick in when exposed to wavelengths between 400-1000 nm ?

Answer 12

44 degrees