The Observation About the Effects of Internal Carotid Artery Stenosis on Fundus Vessels and the Changes of Fundus Vessels After Interventional Therapy

The Observation About the Effects of Internal Carotid Artery Stenosis on Fundus Vessels and the Changes of Fundus Vessels After Interventional Therapy

The investigators plan to collect 30 participants with internal carotid artery stenosis to observed the relationship between the degree of internal carotid artery stenosis and fundus vessels （and blood flow）density before operation, and compared with participants without internal carotid artery stenosis.The fundus blood flow density will be observed after intervention operation in order to see whether the operation is effective to improve the density of fundus vessels and blood flow or not.

Inclusion Criteria:

1. Patients who have been diagnosed with carotid artery stenosis and need surgery;
2. Patients whose vision won't get worse soon;
3. Patients have not had any eye surgeries;
4. Patients with complete profile.

Exclusion Criteria:

1. Patients with severe systemic disease;
2. Patients with poor dioptric stroma;
3. Patients with nystagmus;
4. Patients with incomplete profile.