Which of the following is NOT a diagnostic finding associated with external carotid to internal carotid collateral flow through reversed opthalmic artery?
1) retrograde flow in the ophthalmic artery
2) decreased pulsatility in the ophthalmic artery
3) reversal of flow in the opthalmic artery when compressing the cervical external carotid artery
4) Increased resistance in the opthalmic artery