Choose reading glasses when the question fits its direct job: it add plus optical power for a chosen near working distance, helping compensate for age-related loss of focusing ability; eye care devices instead perform a specific eye-related task such as measuring pressure, warming eyelids, humidifying the eye area, imaging, shielding, or supporting treatment.
The decision depends on different mechanisms. For reading glasses, examine plus power and working distance; for eye care devices, examine intended use and calibration. Conveniences can be compared after the user's actual need is explicit.