dioptre - glasses, carat - ?

DIAMOND
WordClue
FOODdioptre - glasses, calorie - ?
UNITcarat or gallon
CARATglasses - dioptre, diamond - ?
CALORIEglasses - dioptre, food - ?
DIOPTREdiamond - carat, glasses - ?
GLASSEScarat - diamond, dioptre - ?
GOGGLESsafety glasses
SPECTACLESglasses
FOODdioptre - glasses, calorie - ?
CHRISTIANDior, fashion designer