ABO/NAO 5
what is the average convergence distance in children - Answer-2mm instead of 3mm in adults
what is the refractive index of highlite lenses - Answer-1.70
chem-tempering makes a clear glass lens more impact resistant by placing the lens in a potassium
nitrate bath. the lens undergoes a process known as what? - Answer-ion exchange
what is the formula for the index of refraction - Answer-index of refraction=velocity of light in air over
velocity of light in other media
what is polyamide - Answer-a nylon-based material that is very strong. it can be made thinner and is
lighter than cellulose acetate. can be made translucent, is resistant to chemicals and solvents and is
hypoallergenic
when fitting a patient with progressive addition lenses for optimum performance, what is the vertex and
pantoscopic tilt, and is face form required? - Answer-the frame should have sufficient face form, a short
vertex distance as long as the eyelashes do not touch the lens and should be adjustable for pantoscopic
angle of 10 to 12 degrees
what is the average convergence distance in children - Answer-2mm instead of 3mm in adults
what is the refractive index of highlite lenses - Answer-1.70
chem-tempering makes a clear glass lens more impact resistant by placing the lens in a potassium
nitrate bath. the lens undergoes a process known as what? - Answer-ion exchange
what is the formula for the index of refraction - Answer-index of refraction=velocity of light in air over
velocity of light in other media
what is polyamide - Answer-a nylon-based material that is very strong. it can be made thinner and is
lighter than cellulose acetate. can be made translucent, is resistant to chemicals and solvents and is
hypoallergenic
when fitting a patient with progressive addition lenses for optimum performance, what is the vertex and
pantoscopic tilt, and is face form required? - Answer-the frame should have sufficient face form, a short
vertex distance as long as the eyelashes do not touch the lens and should be adjustable for pantoscopic
angle of 10 to 12 degrees
