Contacts And Keratometry

Question 0

Front surface of contact contains the

Answer 0

Refractive power

Question 1

Contacts rest on

Answer 1

Tear film not cornea

Question 2

Regular soft - no oxygen to reach eye
Water in lenses oxygenates the cornea
Not good for dry eyes

Silicone hydrogen 6x more oxygen
Low h2o content prevent bacterial buildup

Answer 2

Rigid excellent oxygen transmission

Question 3

Keratometer (ophthalmometer)

Used for

Answer 3

Uses k as a front surface mirror to measure corneal curvature

Measures
Anterior surface of k in diopters or mm
Central 3mm ( corneal cap)
2 different meridians - horizontal and vertical 
Straying point for CL fitting

Question 4

Hydrogen peroxide lens care system

Answer 4

Place in lens holder basket
Rinse with hydrogen peroxide 5sec
Place lens in holder basket 
Neutralize
Soak at least 6hours

Question 5

Risk of these infections with overwear

Answer 5

Pseudomonas aeruginosa
Acanthoamoeba
Neovascularization lacking oxygen