For spectacles, inmates must submit their requests through the institutions.

These requests are subject to approval before visitors are allowed to hand over the items during the visit sessions. Unapproved items will not be accepted.

For spectacles, only plastic lenses with plain, black, plastic, opaque frames are allowed.

More information can be found here: https://www.sps.gov.sg/visit-matters/other-visit-matters/visit-items/