Visual Field examination is important in the diagnosis of glaucoma and neurologic diseases. In fact, we think it is so important that we have invested in two different advanced visual field testing instruments. Our Zeiss Matrix instrument uses frequency doubling technology to detect glaucoma visual field defects at an earlier stage than could ever before, long before patients will notice any problems with their vision. Our Oculus Centerfield instrument uses a complementary short wavelength technology to detect glaucoma and is the best instrument for detecting neurologic visual field loss.