摘要
The velocity of blood flow in the ophthalmic artery was measured with colorDoppler ultrasound (3. 5MHz). Thirty- five diabetics and twenty - five normals were studied.Peak -systolic velocity (V s ),mean-enveloped velocity (Vin),end-diastolic velocity were compared in the two groups. Diabetic of pathologic eyeground also were compared with diabetic ofnormal eyeground. Results: Vs .Vd.Vm in diabetices were significant lower and RI was significanthigher than normal group. P <0. 0 5. Diabetes with pathologic eyeground had more lower Vd andmore higher RI. Discussion:direct studies of the ocular circulation in humam remaims difficult.Doppler ultrasound we used is a 3. 5MHz pulsed Doppler with a fast Fourier transformation whichis used to derive and analyse the spectrum of returning echoes of various frequencies. It providesdiscriminated signals from specified depths and well defined regions with little attenuation whichis normally produced by the ocular and orbital soft tissues. It has made the non-invasive examination of the ophthalmic artery possible. This study showed:the ophthalmic artery of diabetic wasin a state of low flow velocity and high vascular resistance.
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