Clinical trial NCT01255995: Natural History of IOL in Pseudo Exfoliation Syndrome
Official title: The Natural History of Artificial Intraocular Lenses (IOL) in Eyes With Exfoliation Syndrome
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Pseudo Exfoliation Syndrome
Keywords: PXF
Lead sponsor: Aurolab
Sponsor class: OTHER
First posted: 2010-12-08
Enrollment: 1500
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: PXF subjects with or without glaucoma who require cataract surgery. Controls without PXF who require cataract surgery

Brief summary: * The purpose of this study is to determine the natural course of IOL in PXF,
* To demonstrate use of a clinical grading system for PXF,
* To strategize a way to prevent IOL dislocation, subluxation post operatively,
* To demonstrate intraoperative and long-term post-operative complications associated with phaco and PXF
* To suggest evidence-based ways to minimize these complications, by using capsular tension rings (CTR), specific IOL material or size

Detailed description: Pseudo exfoliation syndrome (PXF) is a generalized degenerative microfibrillopathy that primarily is manifested with deposits of exfoliative material present on the anterior capsule of the crystalline lens, zonules, papillary margin of the iris, corneal endothelium, ciliary body and the trabecular meshwork. The build of this exfoliative material causes microscopic changes of the zonules and their attachments, causing a weakening of the zonules. These clinical findings have implications not only for cataract surgery, as association of lens opacities with exfoliation syndrome is well documented but also for glaucoma, with exfoliative glaucoma being the most common cause for secondary open angle glaucoma in the world.In patients with exfoliation syndrome, small pupil and phacodonesis, comparison between extra capsular cataract extraction and small incision cataract surgery revealed better best corrected visual acuity and fewer intra and post operative complications with the smaller incision for phacoemulsification. The capsular tension rings (CTR) implanted prior to phacoemulsification reduced intraoperative zonular dialysis, increased the rate of capsular IOL fixation, and improved uncorrected visual acuity. Either the degree of lens change the stage of PXF, or the type of IOL might influence long term outcome in PXF associated with cataract surgery:The postoperative course of those with either more advanced cataract or with more advanced PXF may be different than those who have surgery with less cataract our and/or degree of PXF. The stage of PXF alone at the time of cataract surgery may influence outcome. Once PXF identified, surgery performed at an earlier stage of cataract with a softer lens in XFS results in fewer long term problems following phacoemulsification. A standardized way of clinically measuring/monitoring XFS is helpful during large clinical studies Specific intraocular lens design should be considered when scheduling phacoemulsification in patients with PXF.

Eligibility criteria: Inclusion Criteria:

* Age 40-75
* PXF with or without secondary open-angle glaucoma who present with cataract and willing to undergo phacoemulsification with IOL
* Nuclear sclerosis with LOCS III grade and above
* Pupil size more than 4mm on dilatation
* Endothelial cell count \>1,500
* No visible phacodonesis

Exclusion Criteria:

* Uncontrolled IOP/glaucoma
* History of narrow angles, chronic narrow angle glaucoma
* Any pre-existing clinical zonular dialysis or phacodonesis
* Pseudo uveitis
* One eyed patients
* Cardiac pathology
* Uncontrolled diabetes, hypertension \& severe asthma
* Obviously debilitated patients
* Traumatic cataract
* Complicated cataract
* Congenital cataract
* Drug induced cataract
* Shallow anterior Chamber
* Amblyopia
* Dense posterior polar cataract
* Corneal pathology
* Retinal pathology
* RAPD
* Severe visual field defect (MD-\>12.0dB)
* Diabetic retinopathy
* Combined Surgery

Primary outcomes:
measure: IOL Centration / IOL Stability
timeFrame: 10th Year
Secondary outcomes:
measure: Visual Acuity
timeFrame: 10th Year
measure: Anterior capsular fibrosis/phimosis
timeFrame: 10th Year
measure: New onset of phacodonesis
timeFrame: 10th Year
measure: Development or worsening of glaucoma
timeFrame: 10th Year
Other outcomes:
Locations:
city: Coimbatore
country: India
facility: Aravind Eye Hospital
state: Tamil Nadu
city: Madurai
country: India
facility: Aravind Eye Hospital
state: Tamil Nadu
city: Pondicherry
country: India
facility: Aravind Eye Hospital
state: Tamil Nadu
city: Tirunelveli
country: India
facility: Aravind Eye Hospital
state: Tamil Nadu
Study officials:
affiliation: Aravind Eye Hospital
name: Haripriya Aravind, MS
role: PRINCIPAL_INVESTIGATOR
References: