Lecture 8: High Adds, Readers, and Loupes

Calculate logMAR if acuity is 1/40M

1/40M means MAR is 40

10^x=40

log40 = 1.6

so logMAR = 1.6

if DVA is 20/50, what should NVA be?

0.2/0.5

if pt has reduced CS, what else should u prescribe with the reading power?

task lighting

(point lamp over shoulder of better seeing eye)

as a near reader option, PALs shouldn't have more than _D of power

+4D

as a near reader option, flat top BFs shouldn't have more than _D of power

+6D

as a near reader option, round top BFs shouldn't have more than _D of power

+30

gorski doesn't recommend anything larger than _D in a multifocal option

+4D

shorter working distance _ the vergence demand

increases

formula for near PD

Near PD = Dist PD - (1.5 x add power)

other equation for near PD

NPD = (w x DPD) / (z+w)

amt of BI prism in each lens equals the diopic power of the lens plus _

2

8D + 2 is how many BI prism in each lens?

10 BI prism in each lens

strong BI prism + strong readers attempts for _

binocularly

what are microscopics

double lenticular

very heavy

sold in magnification powers of 2x to 12x

how to convert a microscopic into diopters

multiply mag x 4

do microscopics attempt binocularly?

no

3 types of stock lenses

OTC readers

prism readers

microscopics

headband magnifiers max power is _

+10D