الفهرس 
Aim of the workOnly 14 pages are availabe for public view
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Abstract
Cataract is the opacification of the normally transparent lens of the eye and occurs as a result of the denaturation of lens proteins, most cataracts are age-related.
Phacoemulsification is the most commonly performed method of cataract extraction in the developed world. A small incision is made in the cornea and the crystalline lens is removed by ultrasonic fragmentation leaving the posterior lens capsule intact. This allows for a synthetic intraocular lens (IOL) to be inserted through the corneal incision into the capsular bag. [1]
Glaucoma:
Glaucoma is a slowly progressive disease with characteristic optic nerve abnormalities caused by progressive retinal ganglion cell (RGC) loss and concomitant retinal nerve fiber layer (RNFL) thinning.
The result is progressive peripheral and/or central visual defects, which may lead to complete loss of vision [4]
The Intra Ocular Pressure:
There is a general agreement that IOP is the only modifiable risk factor for open angle glaucoma.
Population surveys also support the increased prevalence of open angle glaucoma with increasing IOP (>21mmHg).[6]
The effect of phacoemulsification on postoperative IOP:
A lot of evidence and studies have emerged suggesting that cataract surgery with phacoemulsification (phaco) lowers intraocular
Summary
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pressure (IOP) in the long term. The mechanism by which IOP is lowered is not well understood yet.
Accurate identification of which patients will experience an IOP-lowering could influence surgical decision-making when glaucoma is associated with cataract.
This is a prospective study done at the ophthalmology department of Menoufia University Hospital and Cairo Fatemic Hospital during 2022-2023.
100 eyes of patients, 47 males and 53 females were included in this study who Underwent uncomplicated cataract surgery by phacoemulsification and IOL implantation.
The Study results
The mean preoperative visual acuity was 0.244 ±0.136, increased after cataract removal by phacoemulsification and IOL implantation to 0.761± 0.134.
The mean preoperative intraocular pressure was 13.9 ± 2.143 mmHg and the mean Postoperative intraocular pressure was 12.67 ± 2.11 mmHg in the first week, 11.46 ± 1.72 mmHg at one month and 11.57 ± 1.70 mmHg at three months postoperatively.
Regarding the Effective Phacoemulsification Time (EPT) measured for every patient in the study, it ranges from 1.5 seconds to 88 seconds with a Mean of 22.75 ±13.74 seconds.
There is no statistically significant correlation between postoperative IOP change and the absolute phaco time.
There is a positive correlation between postoperative IOP change and preoperative IOP.