Final Exam Flashcards
A multi-layer antireflection coating on the front surface of a lens would create what color of reflection?
Blue/Green
True or false: hot temperature and presence of UV light will increase the effectiveness of a photochromic lens.
False; UV will indeed increase the effectiveness, and cold temperature (but not hot) will also increase the effectiveness.
The following statement is related most closely to which US agency or organization?
Recommends ophthalmic products for certain sports.
ASTM (American Society for Testing & Materials)
A single layer antireflection coating on the front surface of a lens would create what color of reflection?
Purple
How would you change the following parameters to decrease a patient’s awareness of a ring scotoma from their glasses?
Lens power Vertex distance Lens size Pupil size Lens thickness Base curve
Lens power: decrease Vertex distance: decrease Lens size: increase Pupil size: increase Lens thickness: decrease Base curve: decrease
What is the definition of the Petzval surface?
The surface where the tangential and sagittal foci will coincide when a lens is fully corrected for oblique astigmatism.
What type of light is normally absorbed by the ozone layer?
Infrared, visible, UV-A, UV-B, UV-C
UV-C
True or false: horizontal and vertical prism imbalance are lens parameters that apply even if they are not specified in the prescription.
True.
Which Zernike coefficient corresponds to a blur of about 0.25D?
0.33 microns
Comparing the drop-ball standards for dress lenses to safety lenses, in which of the following categories are the standards the same?
Projectile size, projectile weight, drop height
Drop height (no less than 127 cm [50 inches])
How would you change the following parameters to increase a patient’s awareness of a ring scotoma from their glasses?
Lens power Vertex distance Lens size Pupil size Lens thickness Base curve
Lens power: increase Vertex distance: increase Lens size: decrease Pupil size: decrease Lens thickness: increase Base curve: increase
The following statement is related most closely to which US agency or organization?
Prohibits the inclusion of a disclaimer on a prescription provided to a patient.
FTC (Federal Trade Commission)
Comparing the drop-ball standards for dress lenses to safety lenses, in which of the following categories are the standards different?
Projectile size, projectile weight, drop height
Projectile size (5/8” for dress, 1” for safety) and projectile weight
The following statement is related most closely to which US agency or organization?
Requires a manufacturer to verify that a lens meets impact resistance requirements.
FDA (Food & Drug Administration)
What type of light produces the sensation of warmth? Infrared, visible, UV-A, UV-B, UV-C
Infrared
The following statement is related most closely to which US agency or organization?
Recommends tolerance on the manufacture of prescription ophthalmic products.
ANSI (American National Standards Institute)
What type of light includes the wavelengths of lasers used for refractive surgery?
Infrared, visible, UV-A, UV-B, UV-C
UV-C
The following statement is related most closely to which US agency or organization?
Requires the release of the prescription to the patient at the end of the examination.
FTC (Federal Trade Commission)
The following statement is related most closely to which US agency or organization?
Regulates ophthalmic products in educational settings.
OSHA (Occupational Safety & Health Administration)
What type of light causes solar retinopathy?
Infrared, visible, UV-A, UV-B, UV-C
Visible
True or false: base curve and center thickness are lens parameters that apply even if they are not specified in the prescription, in terms of amount of error the glasses may contain.
False; these apply only when specified in the prescription.
The following statement is related most closely to which US agency or organization?
Requires the dispenser to maintain all records pertaining to the sale of eyewear for at least 3 years.
FDA (Food & Drug Administration)
What type of light causes cataracts with long-term exposure?
Infrared, visible, UV-A, UV-B, UV-C
UV-A
What type of light is typically not absorbed by ocular tissues?
Infrared, visible, UV-A, UV-B, UV-C
Infrared
What type of light causes photokeratitis with short-term exposure?
Infrared, visible, UV-A, UV-B, UV-C
UV-B
