Why isn't a higher concentration of disinfectant used to clean contact lenses?

Disinfection means inactivating all pathogenic microbes but not necessarily all microorganisms. It can be done thru cleaning and rinsing.  In the case of contact lens, they can be disinfected using only a 3% hydrogen peroxide solution – and not higher concentration for safety. With the several commercial disinfecting solutions for contact lenses evaluated in May 1983 – only 3% hydrogen peroxide has a fast disinfection rate of 3-4 hours and has met the safety factor requirement as suggested by FDA.

absolute strength refers to the maximum force exerted by a body irrespective of body size. relative strength on the other hand is the force exerted by a body in relation to muscle size or body weight.

so the answer is: c. absolute strength measures strength regardless of your body size, while relative strength measures strength adjusted for your weight.