Effects of Sustained Reading on the Ocular Surface

General inclusion criteria for all subjects will include: * Ages 50 to 89 years * Capacity to give informed consent. * Self-reported literacy (i.e. a "Yes" answer to the question "Have you learned how to read?") Additional inclusion criteria for the dry eye group will include both of the below: * A previous diagnosis of dry eye syndrome by an eyecare specialist * Ocular Surface Disease Index total scoring of 13 or above Additional inclusion criteria for the Sjögren's syndrome group will include: \- A previous diagnosis of Sjögren's syndrome by an immunology specialist, per ACR criteria 22 Additional inclusion criteria for normal control subjects will include: * No previous history of dry eye diagnosis * Ocular Surface Disease Index total scoring of 12 or under * Total corneal and conjunctival staining score of 0 Exclusion criteria will include: * A binocular vision below 20/25 (with habitual correction) * Any ocular surgery within the last 3 months. * Mental issues, illiteracy, or language problems which might possibly interfere with reading ability * History of taking or current use of topical prescription anti-inflammatory eyedrops (including, cyclosporine and steroids as well as any glaucoma eyedrops). Subjects who are willing to discontinue their treatment for at least a period of 30 days can be placed on a "wash out period" as per the discretion of the investigator and subject safety, and be eligible at the end of this period, given all other criteria have been …