This cohort will receive femtosecond laser cataract surgery with Venturi pump.

This cohort will receive femtosecond laser cataract surgery with peristaltic pump.

Cataract Senile

The venturi pump makes use of the venturi effect to create a vacuum. The venturi effect creates a vacuum by the flow of a fluid, typically air, over an opening. In many phacoemulsification machines, this requires nitrogen tanks or a self-contained air compressor. The vacuum level is created within a rigid drainage cassette, to which the phaco aspiration tubing is connected. Since there is no milking of the aspiration line, the phaco tubing can be made rigid with low compliance.

Venturi pump

The peristaltic pump uses rollers to compress the phacoemulsification outflow tubing in a peristaltic manner, thereby creating flow and vacuum. The compression of the rollers on the tubing with the rotation of the pump physically moves fluid and creates a continuous "milking" action on the fluid column, The phaco machine can directly control this flow level, hence the term flow based, however, the preset vacuum level is only achieved once there is occlusion of the outflow line, typically at the phaco needle tip with cataract material.

Peristaltic vacuum pump

Mercy Clinic Eye specialists

Venturi and Peristaltic Based Phacoemulsification in Femtosecond Laser Cataract Surgery

A Comparison of Venturi and Peristaltic Based Phacoemulsification in Femtosecond Laser Cataract Surgery

Phaco EFX (the effective phaco time with a specific coefficient for the transversal movement of the phaco tip- expressed in seconds.)

Total ultrasound time - measured in seconds

Microscope time - measured in seconds intraoperatively

Laser time - measured in seconds intraoperatively

1) Uncorrected Visual Acuity using the Snellen Eye Chart

Best Corrected Visual Acuity using the Snellen Eye Chart

Pinhole visual acuity using pinhole technique and the Snellen eye chart

Measured in mmHg using an applanation tonometer

The examiner will use a slit lamp microscope to evaluate the eye structures and intra-ocular pressure

Endothelial Cell Count will be evaluated by Konan Specular Microscopy

IOL Master Biometry directly measures the corneal thickness by OCT

Galilei G4 measures central corneal thickness

Adverse Events will be recorded an monitored for each group and compared.

ipomoea trifida/запаљење

Venturi and Peristaltic Based Phacoemulsification in Femtosecond Laser Cataract Surgery

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