The anterior eye is made up of all the bits of your eye that you can see when you look at it. This includes your eyelids and eye lashes, the skin immediately surrounding your eye, your cornea, conjunctiva, sclera, iris and pupil. 

All of the structures need to be looking at to ensure they are healthy and functioning as they should be.

Usually, these structures will be examined using a Slit Lamp. This machine will shine a 

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light towards your eye, and has eyepieces which will magnify what the optometrist can see, allowing them to look at them in much greater detail! 

While this is done during a normal check up, it is also the best way for the optometrist to have a look at any sore or red eyes.