- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01298895
Optical Low Coherence Reflectometry Enables Preoperative Detection of Zonular Weakness in Pseudoexfoliation Syndrome
February 17, 2011 updated by: General Hospital Sveti Duh
The purpose of the study was to evaluate optical ocular components in patients with pseudoexfoliation syndrome using optical low coherence reflectometry.
A prospective cohort study of 224 eyes of patients planned for cataract surgery was conducted from January 2009 until July 2009.
Patients were divided in two groups: the first group of 47 eyes with cataract complicated with pseudoexfoliation syndrome and the control group of 177 eyes with uncomplicated cataract.
Each group was further divided into two subgroups based on its refractive state: emmetropes and hypermetropes.
The optical low coherence reflectometry biometer LENSTAR® LS 900® was used to define ocular optical components.
Study Overview
Status
Completed
Conditions
Detailed Description
Material and methods A prospective cohort study of 224 eyes of patients planned for cataract surgery was conducted at the University Eye Clinic, General Hospital Sveti Duh, Zagreb, Croatia.
The inclusion criteria was age of patients over 40 years.
Sex and refractive eye state were randomly chosen out of all cataract patients operated at the Clinic from January 2009 until July 2009.
Patients were divided in two groups.
The first group consisted of 47 eyes with cataract complicated with PEX.
The control group included 177 eyes with uncomplicated cataract in eyes without other ocular pathology.
Refractive state was defined by preoperatively calculated emmetropisation intraocular lens (IOL) value done by LENSTAR LS 900®.
Emmetropes had IOL value of 20-22 diopters and hypermetropes of more than 22 diopters.
There were no myopic patients defined as IOL value less than 20 diopters in the PEX group operated at the Clinic in the defined time.
Consequently, there were no myopic patients included in the control group.
The PEX group and the control group were further divided into two subgroups: emmetropes and hypermetropes.
LENSTAR LS 900® was used to measure ocular optical components 3-9: axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), retinal thickness (RT), keratometry values (keratometry of the steepest meridian (K1), keratometry of the flattest meridian (K2), its position regarding horizontal line (AXIS) and the difference between K1 and K2 (astigmatism, AST), horizontal diameter of iris (WTW) and pupillary diameter (PD).
Ethics committee approval of General Hospital Sveti Duh, Zagreb, Croatia, was secured for the study reported.
All study procedures adhered to the recommendations of the Declaration of Helsinki.
Written consent was obtained from all patients prior to their inclusion in the study.
Sample size was defined in a way to provide sufficient statistical power of the study, which was in this case over 90%.
Descriptive statistics and Student's t-test were used for data evaluation.
Value of p<0.05 was considered significant.
Study Type
Observational
Enrollment (Actual)
224
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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Zagreb, Croatia, 10 000
- General Hospital Sveti Duh
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
40 years and older (Adult, Older Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Sampling Method
Probability Sample
Study Population
A prospective cohort study of 224 eyes of patients planned for cataract surgery was conducted at the University Eye Clinic, General hospital Sveti Duh, Zagreb, Croatia.
The inclusion criteria was age of patients over 40 years.
Sex and refractive eye state were randomly chosen out of all cataract patients operated at the Clinic from January 2009 until July 2009.
Description
Inclusion Criteria:
- age of patients over 40 years old
- must have cataract
- for the PEX group must have cataract complicated with PEX
Exclusion criteria:
- age below 40 years old
- absence of cataract
- presence of other ocular pathology in the control group
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Observational Models: Cohort
- Time Perspectives: Prospective
Cohorts and Interventions
Group / Cohort |
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PEX group
The first group consisted of 47 eyes with cataract complicated with pseudoexfoliation syndrome (PEX).
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control group
The control group included 177 eyes with uncomplicated cataract in eyes without other ocular pathology
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Study Director: Mladen Bušić, Assoc.Prof., University Eye Clinic, General hospital Sveti Duh, Zagreb, Croatia
Publications and helpful links
The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.
General Publications
- Busic M, Kastelan S. Pseudoexfoliation syndrome and cataract surgery by phacoemulsification. Coll Antropol. 2005;29 Suppl 1:163-6.
- Scorolli L, Scorolli L, Campos EC, Bassein L, Meduri RA. Pseudoexfoliation syndrome: a cohort study on intraoperative complications in cataract surgery. Ophthalmologica. 1998;212(4):278-80. doi: 10.1159/000027307.
- Buckhurst PJ, Wolffsohn JS, Shah S, Naroo SA, Davies LN, Berrow EJ. A new optical low coherence reflectometry device for ocular biometry in cataract patients. Br J Ophthalmol. 2009 Jul;93(7):949-53. doi: 10.1136/bjo.2008.156554. Epub 2009 Apr 19.
- Cruysberg LP, Doors M, Verbakel F, Berendschot TT, De Brabander J, Nuijts RM. Evaluation of the Lenstar LS 900 non-contact biometer. Br J Ophthalmol. 2010 Jan;94(1):106-10. doi: 10.1136/bjo.2009.161729. Epub 2009 Aug 18.
- Rohrer K, Frueh BE, Walti R, Clemetson IA, Tappeiner C, Goldblum D. Comparison and evaluation of ocular biometry using a new noncontact optical low-coherence reflectometer. Ophthalmology. 2009 Nov;116(11):2087-92. doi: 10.1016/j.ophtha.2009.04.019. Epub 2009 Sep 10.
- Hoffer KJ, Shammas HJ, Savini G. Comparison of 2 laser instruments for measuring axial length. J Cataract Refract Surg. 2010 Apr;36(4):644-8. doi: 10.1016/j.jcrs.2009.11.007. Erratum In: J Cataract Refract Surg. 2010 Jun;36(6):1066.
- Liampa Z, Kynigopoulos M, Pallas G, Gerding H. Comparison of two partial coherence interferometry devices for ocular biometry. Klin Monbl Augenheilkd. 2010 Apr;227(4):285-8. doi: 10.1055/s-0029-1245182. Epub 2010 Apr 20.
- Bjelos Roncevic M, Busic M, Cima I, Kuzmanovic Elabjer B, Bosnar D, Miletic D. Comparison of optical low-coherence reflectometry and applanation ultrasound biometry on intraocular lens power calculation. Graefes Arch Clin Exp Ophthalmol. 2011 Jan;249(1):69-75. doi: 10.1007/s00417-010-1509-4. Epub 2010 Sep 18.
- Bjelos Roncevic M, Busic M, Cima I, Kuzmanovic Elabjer B, Bosnar D, Miletic D. Intraobserver and interobserver repeatability of ocular components measurement in cataract eyes using a new optical low coherence reflectometer. Graefes Arch Clin Exp Ophthalmol. 2011 Jan;249(1):83-7. doi: 10.1007/s00417-010-1546-z. Epub 2010 Oct 28.
- Karger RA, Jeng SM, Johnson DH, Hodge DO, Good MS. Estimated incidence of pseudoexfoliation syndrome and pseudoexfoliation glaucoma in Olmsted County, Minnesota. J Glaucoma. 2003 Jun;12(3):193-7. doi: 10.1097/00061198-200306000-00002.
- Klein BE, Klein R, Lee KE. Incidence of age-related cataract over a 10-year interval: the Beaver Dam Eye Study. Ophthalmology. 2002 Nov;109(11):2052-7. doi: 10.1016/s0161-6420(02)01249-6.
- Mccarty CA, Taylor HR. Pseudoexfoliation syndrome in Australian adults. Am J Ophthalmol. 2000 May;129(5):629-33. doi: 10.1016/s0002-9394(99)00466-3.
- Bayramlar H, Ozden S, Ergin M, Tutarli H. Ultrasonografic measurement of ocular refractive components in eyes with various refractive states. T Klin Oftalmoloji 3:90-94, 1994.
- Bartholomew RS. Anterior chamber depth in eyes with pseudoexfoliation. Br J Ophthalmol. 1980 May;64(5):322-3. doi: 10.1136/bjo.64.5.322.
- Kuchle M, Viestenz A, Martus P, Handel A, Junemann A, Naumann GO. Anterior chamber depth and complications during cataract surgery in eyes with pseudoexfoliation syndrome. Am J Ophthalmol. 2000 Mar;129(3):281-5. doi: 10.1016/s0002-9394(99)00365-7.
- Jünemann A, Martus P, Händel A, Naumann GOH. Ocular dimensions in pseudoexfoliation syndrome. Ophthalmic Res 29:88, 1997.
- Kaneda J, Sasaki H, Nagai K, Fujisawa A, Kawakami Y, Sakamoto A, N Takahashi N, Sasaki K. Forward Malposition of the Crystalline Lens in Pseudoexfoliation Syndrome. Invest Ophthalmol Vis Sci 43, 2002.
- Lanzl IM, Merte RL, Graham AD. Does head positioning influence anterior chamber depth in pseudoexfoliation syndrome? J Glaucoma. 2000 Jun;9(3):214-8. doi: 10.1097/00061198-200006000-00003.
- Arnarsson A, Damji KF, Sverrisson T, Sasaki H, Jonasson F. Pseudoexfoliation in the Reykjavik Eye Study: prevalence and related ophthalmological variables. Acta Ophthalmol Scand. 2007 Dec;85(8):822-7. doi: 10.1111/j.1600-0420.2007.01051.x.
- Salzmann M. The Anatomy and Histology of the Human Eyeball , trans. E. V. L. Brown. University of Chicago Press, Chicago, 1912.
- Suzuki R, Kurimoto S. Intraocular muscle function in pseudoexfoliation syndrome. Ophthalmologica. 1992;204(4):192-8. doi: 10.1159/000310293.
- Naseem A. Cataract surgery in patients with pseudoexfoliation. [Dissertation]. Karachi: College of Physicians & Surgeons :111, 2002.
- Yulek F, Konukseven OO, Cakmak HB, Orhan N, Simsek S, Kutluhan A. Comparison of the pupillometry during videonystagmography in asymmetric pseudoexfoliation patients. Curr Eye Res. 2008 Mar;33(3):263-7. doi: 10.1080/02713680801915284.
- Repo LP, Naukkarinen A, Paljarvi L, Terasvirta ME. Pseudoexfoliation syndrome with poorly dilating pupil: a light and electron microscopic study of the sphincter area. Graefes Arch Clin Exp Ophthalmol. 1996 Mar;234(3):171-6. doi: 10.1007/BF00462029.
- Prince AM, Ritch R. Clinical signs of the pseudoexfoliation syndrome. Ophthalmology. 1986 Jun;93(6):803-7. doi: 10.1016/s0161-6420(86)33664-9.
- Mohamed NY, Hassan MN, Ali NA, Binnawi KH. Central Corneal Thickness in Sudanese Population. Sud J Ophthalmol 1:29-32, 2009.
- Oliveira C, Tello C, Liebmann J, Ritch R. Central corneal thickness is not related to anterior scleral thickness or axial length. J Glaucoma. 2006 Jun;15(3):190-4. doi: 10.1097/01.ijg.0000212220.42675.c5.
- Chen MJ, Liu YT, Tsai CC, Chen YC, Chou CK, Lee SM. Relationship between central corneal thickness, refractive error, corneal curvature, anterior chamber depth and axial length. J Chin Med Assoc. 2009 Mar;72(3):133-7. doi: 10.1016/S1726-4901(09)70038-3.
- Hepsen IF, Yagci R, Keskin U. Corneal curvature and central corneal thickness in eyes with pseudoexfoliation syndrome. Can J Ophthalmol. 2007 Oct;42(5):677-80. doi: 10.3129/i07-145.
- Shah S, Chatterjee A, Mathai M, Kelly SP, Kwartz J, Henson D, McLeod D. Relationship between corneal thickness and measured intraocular pressure in a general ophthalmology clinic. Ophthalmology. 1999 Nov;106(11):2154-60. doi: 10.1016/S0161-6420(99)90498-0.
- Ganguli D, Roy IS, Biswas SK, Sengupta M. Study of corneal power and diameter in simple refractive error. Indian J Ophthalmol. 1975 Apr;23(1):6-11. No abstract available.
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start
January 1, 2009
Primary Completion (Actual)
July 1, 2009
Study Completion (Actual)
July 1, 2009
Study Registration Dates
First Submitted
February 17, 2011
First Submitted That Met QC Criteria
February 17, 2011
First Posted (Estimate)
February 18, 2011
Study Record Updates
Last Update Posted (Estimate)
February 18, 2011
Last Update Submitted That Met QC Criteria
February 17, 2011
Last Verified
January 1, 2009
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 0192/09.01.2009.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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