Changes of Macular Vasculature After Uncomplicated Phacoemulsification Surgery Using Optical Coherence Tomography Angiography

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Description

A prospective study of 30 patients with senile or complicated cataract scheduled to do phacoemulsification surgery in Tanta University Hospital Two groups will be divided: Group (1): Cataract will no diabetic retinopathy Group (2): Cataract associated with diabetic retinopathy. All patients will be ...

A prospective study of 30 patients with senile or complicated cataract scheduled to do phacoemulsification surgery in Tanta University Hospital Two groups will be divided: Group (1): Cataract will no diabetic retinopathy Group (2): Cataract associated with diabetic retinopathy. All patients will be subject to Full ophthalmologic examination before the surgery. Imaging will include OCTA. OCTA will be performed using cirrus OCT (Zeiss, Inc., USA). High-quality 6 x 6 mm OCTA macular scans and 3 × 3-mm papillary scan with strong signal-noise ratio with adequate centration on the fovea and optic nerve head respectively will be selected. Segmentation will be used to evaluate super?cial and deep capillary retinal plexus projections in addition to the choriocapillaries. If errors in segmentation were detected, manual correction would be performed. The super?cial retinal capillary plexus (SCP) will be delineated with an inner boundary at the internal limiting membrane (ILM) and an outer boundary 10 µm inside the inner plexiform layer (IPL). The deep retinal capillary plexus (DCP) will be segmented with an inner boundary 10 µm inside the IPL and an outer boundary at 10 µm beneath the outer plexiform layer (OPL). The vessel density metric from enface OCT angiogram will be used as an indicator of macular retinal and papillary perfusion. Vessel density (VD) analysis computes the percentage of area occupied by OCTA detected vasculature in a measured area. Choriocapillaries flow voids will be computed to assess choriocapillaries circulation. The measurements of the OCTA, axial length, intraocular pressure will be obtained before the phacoemulsification surgery. Optical coherence tomography and IOP measurements will also be obtained 1 week after surgery.

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