Ranges of Clear Vision
This formula is used to calculate focal length in centimeters.
f = 1 ÷ D × 100
This lens material has the highest percentage of light transmission
CR-39
Elimination of surface reflections is based on this optical concept
Destructive interference
This organization sets standards for sports impact protection
ASTM
Near‑variable (office) lenses offer this major advantage over PALs for desk workers
wider, more usable intermediate/near zone
What is the factor(s) that effect the ADD power?
Accommodative Amplitude
Accommodative Reserve
Near fixation distance
Polycarbonate and Trivex inherently filter UV radiation. Name one more material that also does
Hi-Index 1.67
This AR feature helps shed water and oils
hydrophobic/oleophobic coating
There is no difference in the polycarbonate lenses in safety glasses than dress eyewear, it is just the frame that must meet Z87+ standards. True/False
False
This manufacturing method digitally surfaces the corridor using tilt, wrap, vertex, monocular PD, and height.
Freeform
If the distance range ends farther out than the near range begins, the patient has this problem
blur gap
The darkening process of glass photochromic lenses occurs when this compound is activated
Silver halides
Name the four types of glare discussed in class
distracting, discomforting, disabling, and blinding glare
High‑impact (high velocity) testing uses a ¼‑inch steel ball traveling at this speed
150 ft/s
What is the difference between a variable corridor and a fixed corridor?
Variable: lab decides length based on seg height. Fixed: Optician chooses length/ custom
A patient with low amplitude and a high ADD will almost always require this lens design to access all ranges.
Progressive lens
The FDA requires sunglasses to transmit no more than this percentage of UV‑B
NOT more than 1% UV‑B
The Anti-static properties of AR that help repel dust and debris is a [feature/ benefit]
Anti-static is a feature
Benefit is that it repels dust and debris
High‑mass impact testing uses a projectile weighing this amount.
500g
Aspheric lenses change curvature gradually away from center. Name one advantage
reduced bulk or improved off‑axis performance
Donder’s Table illustrates this relationship
the decline of amplitude with age and the receding near point
This condition can occur after excessive UV exposure and causes pain, tearing, and redness
photokeratitis
3 lens types/coatings that reduce disabling glare but do NOT eliminate blinding glare
AR, photochromic, tint
Sports eyewear must include three markings. What are they?
Manufacturer’s identity
Eye protector model identity
ASTM F803 designation
Hard design progressives have distortion compacted into the corners, resulting in this adaptation characteristic
sharper blur and harder first‑time adaptation