What exactly are clock hours when it comes to the eyeball in opthamology and how is it used for measuring things like different melasmas of the eye?

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I was viewing a lecture on opthamology online and they mentioned eye clock hours in the context of certain eye lesions having more or less clock hours than others. It left me very confused.

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Anonymous 0 Comments

“Clock hours” in ophthalmology are used as a way of orienting what you are talking about in the eye. Think about how a fighter pilot might say something like “On your 6 o’clock!” to refer to something directly behind the person they are addressing. Imagine overlaying an analogue clock face on the eye and consider the hours to be directions.

I suspect that if they are referring to certain lesions as having more or fewer “clock hours” they are referring to the amount of area covered by the lesion.