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For how long have you had this symptom?
Is the wavy pattern noticed only on closing the eyes?
Is it associated with any flashes of light also?
Are you short sighted?
Unlikely to be due to migraine as it is in the same spot and noticed more so on closing the eyes. It might be more so due to changes in the vitreous, which is a thick gel present in the back of the eye. The vitreous can undergo liquefaction as we grow older. This tends to cause flashes of light in some individuals. Over a period of time the vitreous gets detached from its surrounding retina. This causes wavy patterns which are more pronounced in the dark or on closing the eyes. However it is not a cause of worry but needs a dilated eye exam by an ophthalmologist in near future.
Unlikely to be related to thyroid hormones as such.
Is there anything else that I can answer for you?