1. Your glasses preseription reads as follows OD oS -4.5-2.0 x 120 -3.0 For each
ID: 3279550 • Letter: 1
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1. Your glasses preseription reads as follows OD oS -4.5-2.0 x 120 -3.0 For each eye interpret (a) the refractive emor and or other condion in medically correct terminology and (b) the focal lengths of the spherical correction for cach eye. Give the absolute value rounded to two decimal places. (4) a): Left eye: la (L) la (R) lb (L) b (R) Right eye: b): Left eye: Right eye: 2. Your grandfather has enjoyed very good vision for most of his 73 years. He still likes to read the newspaper to stay up to date on current events. You realize one day that he holds his paper at a distance of 13 inches from his face, which makes his arm tired after a while. You think he might benefit from some reading glasses. What condition is your grandpa mostly likely suffering from (in medically correct temninology)? 2a. What power of glasses should he look for? (Round to the nearest 0.25 power) (1) 2b 3. You are designing software for a warehouse operation in Houston. Packers stand 5 feet away from a computer display that gives them a line of numbers for each order. Assuming they ane licensed drivers in Texas with no restrictions, how tall should numbers and letters be on this screen to assure legibility and thus minimize errors in filling orders? To assure legibility, it is recommended that you use a safety factor of 2x the minimum. Round to two decimal places. e)Explanation / Answer
Question1)
OD (ocular dextrous) means right eye. OS (ocular sinister) means left eye. There will be three numericals following OD and OS. The first one represents the spherical portion of the prescription. It can be either short sightedness (negative sign) or long sightedness (positive sign). The second number represents the degree of astigmatism and the third number represents the orientation of astigmatism.
1a (L) - 3 diopters of near sightedness
1a (R) - 4.5 diopters of near sightedness with 2 diopters of astigmatism and an axis of 120 degrees.
b) Focal length of lens can be calculated by taking reciprocal of spherical correction.
1b(L) - (1/3) is 0.33 m or 33 cm
1b(R) - (1/4.5) is 0.22 m or 22 cm
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