Question

Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Which best describes glaucoma?
A). a recessive trait that requires multiple recessive alleles to be expressed
B). a polygenic trait that is influenced by the number of alleles present
C). a codominant trait that is expressed more often when more dominant alleles are present
D). a dominant trait that depends on the presence of only one of many dominant alleles

Answer 1

 Glaucoma is an eye disease where there is too much pressure built up from fluid affecting the peripheral vision. Peripheral vision meaning the edges of your visual field. 
The doctor saying that it's borderline means that it's almost glaucoma but it hasn't gotten there yet. 
Some treatments for glaucoma include drops to help relieve the pressure behind the eyes and other medications.