June 2015
Volume 56, Issue 7
ARVO Annual Meeting Abstract  |   June 2015
The Effect of Phacoemulsification on Outflow Facility
Author Affiliations & Notes
  • Pouya Alaghband
    Ophthalmology, St Thomas' Hospital, Halifax, United Kingdom
  • Lizzie Galvis
    Ophthalmology, St Thomas' Hospital, Halifax, United Kingdom
  • Brian Chu
    Bioengineering, Imeprial College London, London, United Kingdom
  • Michael Madekurozwa
    Bioengineering, Imeprial College London, London, United Kingdom
  • K Sheng Lim
    Ophthalmology, St Thomas' Hospital, Halifax, United Kingdom
  • Footnotes
    Commercial Relationships Pouya Alaghband, None; Lizzie Galvis, None; Brian Chu, None; Michael Madekurozwa, None; K Sheng Lim, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 3305. doi:
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      Pouya Alaghband, Lizzie Galvis, Brian Chu, Michael Madekurozwa, K Sheng Lim; The Effect of Phacoemulsification on Outflow Facility . Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):3305.

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      © ARVO (1962-2015); The Authors (2016-present)

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To elucidate the effect of phacoemulsification on outflow facility in eyes with and without POAG after cataract extraction.


Patients recruited from the glaucoma and the cataract clinics at St. Thomas’ Hospital when they fulfil the inclusion/exclusion criteria. Inclusion criteria: Age ≥ 21. Lens opacity deemed enough to be causing reduced vision in the opinion of the supervising consultant. Diagnosis of primary open angle glaucoma (POAG) or no glaucoma. POAG is defined as glaucomatous optic neuropathy together with an IOP>21 mmHg on at least one occasion and visual field defects (using the 24-2 test pattern on a Humphrey Field Analyser) and a gonioscopic angle width of 3 or 4 and normal in appearance. Exclusion criteria: Previous intraocular surgery. Previous ocular trauma that can cause damage to the drainage angle (e.g. angle recession). INR>3.0 on the day of surgery (for the patient on warfarin). Anterior segment neovascularisation. Chronic use of systemic or topical steroid. Any other concurrent ocular disease e.g. uveitis, diabetic retinopathy, corneal disease, etc. Measurement: 1) Outflow facility measured by electronic Schiotz tonometer at baseline and 3 month post-operatively 2) IOP measurement was done by Goldmann applanation tonometer at pre-operation, 1 day, 1 week, 3 and 6 months post surgery. Main outcomes - Outflow facility: to compare the results before and after surgery. Intraocular pressure: compare results before and after surgery.


Forty patients were recruited. Twenty five eyes of 25 patients who had reliable tonography results were included in the final data analysis. Nine black subjects, 15 white and one Chinese patients. POAG was found in eight eyes. 60%(15) were male. Baseline characteristics are shown in table 1. Tonographic outflow facility increased significantly from baseline of 0.14±0.07 to 0.21±0.1µL/mmHg/min at 6 month (p=0.007). The number of medications in POAG patient remained the same at 6 months (p=0.1). Furthermore, significant IOP reduction was observed at 3 months (16.4±4.2; 14.9±3.2 mmHg p=0.008) post operatively.


This study confirmed that routine phacoemulsification enhanced tonographic outflow facility at 6 months post-surgery.  



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