QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT ANSWERS)
ALREADY GRADED A+
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 - (answers)Myopia
Difficulty accommodating* due to the crystalline lens becoming less elastic. -
(answers)Presbyopia
Around what wavelenght of light is thought to cause cataracts - (answers)460 nm
Axis pliers are meant to do what - (answers)Turn and rotate a lens
Cr39 Index and abbe - (answers)Index 1.49 Abbe 59
Crown glass index and abbe - (answers)Index 1.523 Abbe 60
Trivex Index and abbe - (answers)Index 1.54 Abbe 43-45
Polcarbanate index and abbe - (answers)Index 1.58 Abbe 30
Hight index 1.60- 1.67 index and abbe - (answers)1.6 abbe 36, 1.67 abbe 32
Ultra high index 1.70- 1.7.4 index and abbe - (answers)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 - (answers)ASTM
, What indication on a frame or glass indicates a pair of saftey glasses - (answers)ANSI Z87.1
how thick does a lens from a pair of safety glasses have to be - (answers)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 ? - (answers)Within the recticle
What is a distometer used for? - (answers)Measuring vertex distance between the front of the eye
and the back of the lens
What is a phoropter used for ? - (answers)measures the eye's refractive error to help determine
and eye prescription
What is a poalriscope used for? - (answers)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 - (answers)Hyperopia
A condition where the eyes have unequal refractive power, greater than 1 diopter. -
(answers)Anisometropia
A condtion where the two eyes have opposite signs. One eye is Hyperopic and the other eye is
Myopic. - (answers)Antimetropia
ANSI standards for horizonal prism - (answers)0.66△
ANSI standarda for vertical prism - (answers)0.33△