Final answer:
Initial parameters for Air Optix Aqua MF lenses should be chosen using the patient's previous prescription and manifest refraction to ensure accurate vision correction, taking into account the refractive indices of eye components that affect light focusing.
Step-by-step explanation:
When choosing initial parameters for Air Optix Aqua Multifocal (MF) contact lenses, the correct option is B. Using the patient's previous prescription and manifest refraction. This ensures the chosen parameters match the patient’s vision needs accurately. Option A is incorrect since the patient's favorite color has no bearing on the efficacy of the contact lenses. Option C is not advisable as selecting parameters randomly could result in a poor fit and ineffective vision correction. Option D is also not suitable, as guessing is not a precise method for something as important as vision correction.
It is important to understand that the proper fit and prescription of contact lenses are based on specific ocular measurements and the patient's refractive error. The refractive indices of the cornea, aqueous humor, and lens are pertinent to understanding how light is focused on the retina: (B) The cornea, aqueous humor, and lens of the eye have greater refractive indices than air. As a result, (B) Rays entering the eye are refracted towards the central axis, which enables them to converge at the focal point on the retina for clear vision.