Just saw a video about leaks and rumors about Apple glasses which may come out in 2022. One interesting feature seems to be the possibility to adjust for myopic refraction errors, either manually or automatically. This is the relevant paragraph from the patent.
As another example, left and right optical modules may adjust the images displayed to account for limitations or corrections (e.g., by glasses or contact lens) of the user’s eyesight. For example, if a user is myopic in one eye, the optical module associated with that eye may modify the image displayed to correct the user’s myopia. The system may determine the correction required for each eye, if any, using any suitable approach. For example, the user may enter a glasses or contact lens prescription that indicates the required correction. As another example, each optical module may automatically analyze the user’s eyes, and determine the adjustment needed based on the analysis. This may allow users who normally wear glasses to use system without their glasses, which may lead to discomfort.
The patent is here: https://patents.google.com/patent/US20100079356A1/en