Retinal detachments correspond to a separation of the neuroepithelium from the pigment epithelium. They can be exudative (sometimes in conjunction with a tumor), tractional, traumatic (postoperative) or rhegmatogenous (in relation to a tear).

Ultrasound, requested when the fundus is difficult to achieve and shows a hyperechoic mobile membrane. It can also measure the hemodynamic parameters of retinal arteries.

A preliminary study showed a correlation between systolic velocity in the central retinal artery and postoperative visual acuity.

The aim of this study is to confirm those preliminary data.

Inclusion Criteria:

• Patients over 18 years
• rhegmatogenous retinal detachment, relapsing or not, including pseudophakic retinal detachment or aphakic retinal detachment, if the retinal detachment occurs more than three months after phacoemulsification

Exclusion Criteria:

• traumatic retinal detachment
• bilateral retinal detachment
• less than 3 months after phakoemulsification
• predictable follow-up of less than 6 months
• patient under of legal protection
• patient's opposition to participate
• absence of affiliation to the social security
• eye's axial length> 25.5 mm
• preoperative visual acuity greater than 70/100
• no surgery