Buy One Pair Of Contacts -

Some optical shops may have individual diagnostic lenses or "trial" packs in stock that they can sell or provide in an emergency.

Most major retailers sell contacts by the box rather than the pair, but you can often secure a single pair through these methods: buy one pair of contacts

You cannot legally buy contacts (even non-corrective colored ones) without a valid prescription from an eye doctor. A contact lens prescription includes specific details like the base curve (BC) and diameter (DIA) that are not found on a standard glasses prescription. Some optical shops may have individual diagnostic lenses