Can the OKIOCAM enlarge documents for the visually impaired?

Possibly, but dependent on the source material. OKIOCAM does not have in-built zoom functionality, but you can use the OKIOCAM Snapshot and Recorder application to digitally zoom in up to 6x. Please keep in mind that the camera does not actually have a physical zoom lens, it is a digital zoom function where the image is digitally enlarged. This does have some limitations in that the image may appear grainy at very high zoom levels. Your results may vary depending on the size of the text you are trying to magnify. Extremely small text possibly may not yield satisfactory results due to pixelation when a digital image is enlarged at a high zoom level. OKIOCAM T has a higher megapixel count compared with OKIOCAM S, so it will have less image degradation at higher zoom levels.