Liz Buchanan BVSc MRCVS
Keymaster
So what could it be? Trauma - a scratch to the surface (even a tiny one) a foreign body (even a tiny one) or direct injury are all possibilities. There are also some anatomical changes that can affect eyes - a lash brushing against the globe's surface, for example, instead of growing in the usual direction, is known as entropion and can cause havoc. Lumps to the surface and other awkward anatomy may be obseved, along with blockages to the tear-duct - for example, a lump or polyp in the nose. In short then, there is a big range of changes that can affect the eye and tests are general needed in order to establish what is going on. However, the squinting that you are describing implies pain, so I reiterate that this ought to be done quickly.
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