Inclusion Criteria:

• Male and female patients attending hospital eye clinics, aged 3 - 99, inclusive.
• Patients able to understand the information sheet, and willing and able to give informed consent to participate.
• Patients with visual function ranging from normal to severely impaired.
• Willing and able to comply with the visual function testing protocol.
• Some validation studies require recruitment of disease specific groups (such as children with amblyopia or adults with age related macular degeneration).

For Part B of the project which aims to develop and pilot a home monitoring application, only adult (18-99 years) subjects complying with the above who also own a suitable browser device will be recruited.

Exclusion Criteria:

• Unwilling or unable to comply with the visual function testing protocol.
• Unwilling or unable to give informed consent.
• Unwilling to participate.
• In other research trials.