Macular Telangiectasia Diagnosis
Your ophthalmologist may find small, fine crystals in the center of your macula. This is a sign of macular telangiectasia.
First, your eye doctor will perform a thorough assessment of your vision. This will include testing with an Amsler grid to detect any wavy or dark areas in your central vision. The doctor will then dilate (widen) your pupils using eye drops. They will examine your eyes with an ophthalmoscope. This device allows him or her to see the retina and other areas at the back of the eye.
If your ophthalmologist suspects you have MacTel, he or she usually will take special photographs of your eye. The doctor will take them using optical coherence tomography (OCT) and fluorescein angiography (FA).
OCT scanning uses light waves to make images of the underlying structure of the retina. These images show the thickness of the retina. They can help your ophthalmologist detect swelling and abnormal blood vessels.
During FA, a vegetable-based dye is injected into a vein in your arm. The dye travels throughout the body, including your eyes. FA captures images of your retinal blood vessels as the dye passes through them. The dye highlights abnormal areas. Fluorescein angiography is often repeated occasionally, especially if vision is worsening.