Blurred vision – if your vision is out of focus, or your eyesight lacks sharpness, you may have blurred vision. This can be caused by short-sightedness, long-sightedness and astigmatism, but it can also be symptomatic of dry eyes, eye changes during pregnancy or neurological disorders. Cataracts can also cause blurred vision, causing problems seeing in very dim or bright light, and a halo effect around bright lights, or double vision. If your blurred vision has suddenly appeared, please arrange a check-up with your optician.
Double vision – also known as diplopia, or ghost images, can occur for several reasons, like intoxication or inadequate sleep. It can also be the result of a severe health problem, such as a stroke, head injury, brain tumour or brain aneurysms. Sometimes cataracts can cause double vision, more often in one eye, as can cranial nerve palsies, which involve the paralysis or loss of coordination of one or more muscles involved in the movement of the eyes. Special contact lenses, eye drops and punctal plugs or surgery can help with double vision. If you experience sudden double vision, please arrange a check-up with your optician.
Higher order aberrations – also known as HOAs or coma, trefoil and spherical aberrations. These conditions make it hard to see at night due to experiencing halos, glare, blurring, double vision and starburst patterns. Everyone has some sort of higher-order aberration varying by degrees, so there is little cause for concern unless it disrupts your vision.
Peripheral vision and tunnel vision problems – tunnel vision makes you feel as if you are seeing through a narrow tunnel due to an abnormality in your wide angle field of vision. It can also make seeing in dim settings and navigating while walking more difficult. Peripheral vision problems like this can be caused by optic nerve damage from conditions such as glaucoma, eye strokes, or eye injuries. It can also be caused by compressed nerves and concussion. If you experience sudden tunnel vision, please see your optician as this could indicate a detached retina.

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Contact lenses and vision problems