Inclusion Criteria:  Patients are eligible for the study if all inclusion criteria are met:  Voluntary informed consent. Aged at least 18 years. Fully registered patient attending the Manchester Royal Eye Hospital Patients deemed eligible to have OCT scan by healthcare professional performing the scan. Participant has a transparent optical media. Patients are having an optical diagnostic imaging as part of their standard of care.  Exclusion Criteria:  Patients are excluded from the study if any of the following criteria apply:  1. Cataracts or prior history of cataracts.  -