The term anomers of glucose refers to

defination of anomers ; cyclic carbohydrate which is equlibrium with it's open chain structure and different configration of  H and OH at one chiral carbon is known as anomers.

Due to cyclic hemiacetal or cyclic hemiketal structures, all the pentose and hexoses exit in two stereosiomeric forms i.e,$\propto$from in which the OH at C₁ in aldose and C₂ in ketoses lies towards the right and $\beta$ form in which it lies towards left. Thus glucose,fructose,ribose,etc.,all exist $\propto$and $\beta$form. Glucose exists in two forms $\propto$-D glucose  and $\beta$-D glucose $\propto -\text{D}-(+)\text{glucose}\leftrightharpoons \text{equilibrium mixture}$ 
$\beta -\text{D}-(+)\text{glucose}$ As a result of cyclization the anomeric (C-1) becomes asymmetric and the newly formed - OH group may be either on left or on a right in Fischer projections thus resulting in the formation of two isomers (anomers). The isomers having - OH group to the left of the C-1 is designsted $\beta -\text{D}-\text{glucose}$ and other having - OH group on the right as $\propto -\text{D}-\text{glucose}$.