TDA Online Continuing Dental Education

Exam for The Possible Ocular Hazards of LED Dental Illumination Applications - Exam 51

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Description: The use of high-intensity illumination via Light-Emitting Diode (LED) headlamps is gaining in popularity with dentists and student dentists. Practitioners are using LED headlamps together with magnifying loupes, overhead LED illumination and fiber-optic dental handpieces for long periods of time.

1. In the dental setting, there exists the potential for LED light–induced retinal damage to dentists due to:

a. Cataracts which have not been removed
b. The glare and/or reflection of light
c. Lack of magnification by dental loupes when using a dental headlamp
d. Specific standards provided by OSHA for dentists

2. Which of the following statements are true: Statement 1 – Visual perception occurs when radiation with a wavelength between 400 and 700 nm reaches the retina. Statement 2 – Green wavelengths of light are just as hazardous to the eyes as blue wavelengths of light Statement 3 – Visible light is referred to as short- (blue), medium- (green), and long-wavelength (red) radiation. Statement 4 –All LED light sources contain a blue wavelength component:

a. 1, 2, 3
b. 2, 3, 4
c. 1, 3, 4
d. all of the above are true

3. Which of the following is NOT true:

a. Set the brightness of the overhead operatory light to a minimum brightness level which allows you to see details
b. Avoid any LED headlight which does not disperse colors
c. “Cooler” white LED light has a higher blue-light component
d. Avoid any LED headlight which has too a strong of a blue-light component

4. At very high intensities, blue-light (short-wavelength) can destroy the photopigments which then act as free radicals and cause irreversible, oxidative damage to retinal cells, up to blindness. What is the approximate wavelength range of blue-light on the wavelength spectrum:

a. 300-400 nm
b. 300-500 nm
c. 400-500 nm
d. 400-600 nm

5. Statement 1 – Light intensity and the duration required to cause a certain level of damage are correlated, and a longer light exposure can substitute for the use of a lower intensity. Statement 2 – Red light of certain intensity is insufficient to induce retinal damage, whereas blue-light of the same intensity will cause retinal injury.:

a. Both Statements are true
b. Both Statements are false
c. Statement 1 is true and Statement 2 is false
d. Statement 1 is false and Statement 2 is true