Which of the following sites has volcanoes related to subduction? A is on an island arc, B is in the Andes, C is near Hawaii, D is along a mid-ocean ridge. 
Definitions:
Keratometer
An instrument used to measure the curvature of the anterior surface of the cornea, particularly in determining the degree of astigmatism.
Exophthalmometer
An instrument used to measure the degree of forward displacement of the eyeball, as seen in conditions like Graves' disease.
Tonometer
An instrument used to measure the pressure inside the eye, important in glaucoma diagnosis.
Macular Degeneration
A progressive eye condition affecting the macula (part of the retina) that leads to vision loss.
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