In some ways, online eye tests and in-person eye tests, with eye care professionals, are similar. They can both help with identifying colour blindness, spatial awareness problems, astigmatism, the dominance of one eye over the other and generally poor visual sharpness. Both tests also usually involve tools like the Ishihara colour test and eye charts, as seen below.

Plus, these online eye tests often feature a question and answer element that can be used along with the eye charts. Some of these questions can include:

• Do you struggle to read distant road signs clearly and without difficulty?
• When you focus for prolonged periods on something, do you experience headaches?
• Focus on something around 6 metres from your eyes and cover one eye. Now cover the other eye. Do you experience blurred sight?
• If you're aged 40 and over, do you have difficulties when looking at close up images or objects?
• When using the computer for a long time, do your eyes feel watery, dry, itchy, fatigued or painful?

If you happen to answer 'yes' to any of them, then swiftly scheduling an appointment with your optician is a must. Once you've completed your eye assessment online, you'll also receive a full summary of the results, as well as some suggestions about your vision, which you can discuss during your next physical appointment.

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Online eye tests - what are they and do they work?