'Pèi yǎn jìng' literally means 'to match/fit eyes and glasses' — the verb 配 (pèi) here signifies the process of selecting, adjusting, and customizing eyeglasses to suit an individual’s vision prescription and facial features. 眼 (yǎn) means 'eye' and 镜 (jìng) means 'lens' or 'glasses', so together the phrase emphasizes the medical and technical procedure—not just buying glasses, but undergoing an eye exam, choosing frames, and ensuring optical accuracy.

This term is used exclusively in healthcare and optometry contexts. It implies professional involvement: an optometrist or ophthalmologist prescribes lenses, and an optician fits them. You would say 配眼镜 when scheduling an appointment, describing a recent visit, or explaining why you need time off work. It is not used for purchasing ready-made reading glasses or sunglasses without a prescription — those actions are described with verbs like 买 (mǎi, 'to buy') or 挑 (tiāo, 'to pick out').