Term
| Which type of contact lenses would be best for protecting against chemical irritants? |
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Definition
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Term
| Which type of contact lense would be best for protecting against mechanical irritants? |
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Definition
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Term
| What sport is the highest on the list of eye injuries? |
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Definition
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Term
| What is the leading cause of serious eye injuries in the U.S.? |
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Definition
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Term
When do illuminance levels have the largest effect on human performance? |
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Definition
| When contrasts are low or the size of the object you're working with is small. |
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Term
| Who came up with the oversimplified phrase, "More light, better sight!" |
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Definition
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Term
| What is the unit for illuminance? |
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Definition
fc=foot candles (lumens)/(ft2) lx=Lux (lumens)/(m2) |
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Term
| What are the units of luminance? |
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Definition
| ft-lamberts or Lumens/steradian/m2 |
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Term
| What is the amount of light incident on a surface? |
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Definition
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Term
| What is the amount of light reflected from a surface? |
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Definition
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Term
| What is the mathematical expression for reflectance? |
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Definition
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Term
| What is the term for a complete lighting unit consisting of light source, housing, supports, shields, etc.? |
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Definition
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Term
| Does direct or indirect lighting produce harsh shadows and marked effects from the work surface? |
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Definition
| Direct lighting, Indirect lighting provides diffuse lighting with minimal shadows and reflections. |
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Term
| How do you determine how much light should be used in a given work environment? |
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Definition
IESNA (Illuminating Engineering Society of North America) looks at 1. the task characteristics 2. the criticality of performing the tasks 3. the age of the users |
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Term
| What do you call the ratio between the task you're doing and the surrounding illumination? |
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Definition
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Term
| What is the term for how natural and normal a light source makes things appear? |
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Definition
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Term
| What types of lights are Mercury vapor, sodium vapor, and metallic halide examples of? |
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Definition
| HID (High intensity discharge lights) |
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Term
Does the Color Rendering Index (CRI) tell you about what any particular color will look like? |
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Definition
| No, it's the average and refers to how natural and normal a light source makes things appear. |
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Term
| What is the middle of the range of subjective judgments about how uncomfortable a light source is? |
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Definition
BCD luminance BCD-measured between the border of comfort and discomfort |
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Term
| What are two things that can improve the uniformity of illumination? |
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Definition
1. closer spaced lights 2. room surface reflectance's improve uniformity (painting the cielings and off white color to increase illumination) |
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Term
| IESNA considers a rooms illumination to be uniform if the minimum level is not less than 1/6 the average and the maximum illumination level is not more than 6 times the average |
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Definition
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Term
| What do you call light that is in the same phase, in the same wavelength and the same direction? |
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Definition
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Term
| What is the range of duration of a pulse laser? |
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Definition
| femtoseconds to milliseconds 10-15 to 10-6 |
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Term
| How long does the pulse duration have to be for a laser to be considered a CW (continuous wave) laser? |
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Definition
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Term
| What ANSI standard details the safe use of lasers? |
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Definition
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Term
| What ANSI standard details the safe use of lasers in healthcare facilities? |
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Definition
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Term
| Given the low levels of power output in class 1-3 lasers, how could they cause any damage? |
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Definition
1. the human eye is an imaging system and focuses light so that energy levels at the same energy levels at the cornea can be 100,000 times greater by the time they get to the retina 2. LASER light demonstrates coherence. |
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Term
| What labels should be on any eye laser protection device? |
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Definition
1. Optical density appropriate to laser output (power) 2. Wavelength specific 3. Lenses marked with wavelength and optical density. |
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Term
| What do you call the fact that laser protection equipment may be compromised with repeated laser exposure? |
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Definition
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Term
| What three assumptions are made when calculating the Maximum Permissible Exposure for the eye to avoid injury from a LASER? |
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Definition
1. The eye is perfectly refracted for the insulting wavelength. 2. The pupil is 7 mm in area. 3. The aversion response will take 0.25 seconds to occur even though most individuals can blink and turn their head within 1/10th second of irradiation. |
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