Person`s e.g. presbyope, sight correcting device for use as powerful magnifying glass, has pinhole pierced into card in order to satisfy requirements of diffraction of light, and placed on eye, when card is applied against eye

摘要

The device has a rigid card (1) of specific dimensions, where a calibrated pinhole (2) is pierced into the card in order to satisfy requirements of diffraction of light. The card has a black portion (3) for increasing contrast. The pinhole is placed on an eye, when the card is applied against the eye.