A condition of the eye in which light focuses in front of the retina. Caused by either the eye being too
strong or the globe of the eye being too long - -------CORRECT ANSWER---------Myopia
Difficulty accommodating* due to the crystalline lens becoming less elastic. - -------CORRECT ANSWER----
-----Presbyopia
Around what wavelenght of light is thought to cause cataracts - -------CORRECT ANSWER---------460 nm
Axis pliers are meant to do what - -------CORRECT ANSWER---------Turn and rotate a lens
Cr39 Index and abbe - -------CORRECT ANSWER---------Index 1.49 Abbe 59
Crown glass index and abbe - -------CORRECT ANSWER---------Index 1.523 Abbe 60
Trivex Index and abbe - -------CORRECT ANSWER---------Index 1.54 Abbe 43-45
Polcarbanate index and abbe - -------CORRECT ANSWER---------Index 1.58 Abbe 30
, Hight index 1.60- 1.67 index and abbe - -------CORRECT ANSWER---------1.6 abbe 36, 1.67 abbe 32
Ultra high index 1.70- 1.7.4 index and abbe - -------CORRECT ANSWER---------1.7 abbe 36, 1.74 abbe 33
If somone chose a pair of lenses to put in a frame for primary sports use what orginazation would have
checked the safety of the lenses - -------CORRECT ANSWER---------ASTM
What indication on a frame or glass indicates a pair of saftey glasses - -------CORRECT ANSWER---------
ANSI Z87.1
how thick does a lens from a pair of safety glasses have to be - -------CORRECT ANSWER---------3 mm
thick or on a perscription higher than +3 at its thinest part needs to be 2 mm
Where is the concentric circles in a lensometer ? - -------CORRECT ANSWER---------Within the recticle
What is a distometer used for? - -------CORRECT ANSWER---------Measuring vertex distance between the
front of the eye and the back of the lens
What is a phoropter used for ? - -------CORRECT ANSWER---------measures the eye's refractive error to
help determine and eye prescription
What is a poalriscope used for? - -------CORRECT ANSWER---------it measures internal stress within lens
A condition of the eye in which light rays are focused behind the retina Caused by the eye being too
weak or the globe of the eye being too short - -------CORRECT ANSWER---------Hyperopia
A condition where the eyes have unequal refractive power, greater than 1 diopter. - -------CORRECT
ANSWER---------Anisometropia
A condtion where the two eyes have opposite signs. One eye is Hyperopic and the other eye is Myopic. -
-------CORRECT ANSWER---------Antimetropia
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