Final answer:
Initial choice of distance and near power for Acuvue Oasys for Presbyopia lenses involves subjective refraction testing, with age and refractive error as additional factors. Presbyopia, often related to age, impairs near vision and may require reading glasses even after procedures like LASIK.
Step-by-step explanation:
Choosing the initial distance and near power for Acuvue Oasys for Presbyopia contact lenses primarily involves a subjective refraction test, which is carried out by an eye care professional. During subjective refraction, different lens powers are placed in front of the eyes, and the patient provides feedback on which lenses give the clearest vision. This allows the optometrist to determine the precise correction needed for both distance and near vision. The initial lens power can then be fine-tuned through further testing or using standardized charts. Additionally, factors such as age and existing refractive error are considered, but these are typically starting points rather than definitive determinants of lens power.
For someone with presbyopia, the ability to focus on near objects is diminished, usually due to aging. In such cases, reading glasses or multifocal lenses may be needed to correct near vision even if distant vision is clear. This loss of accommodation means that even after LASIK or other vision correction procedures for distant vision, reading glasses may still be necessary.