Cataract Surgery to Obtain Human Lens Material for the Study of Nuclear Cataracts

NCT00001613 | Completed

• 2 other identifiers: 97012197-EI-0121
• Study Type: observational
• Target: 96
• Locations: 1 country
• Sites: 1

Brief Summary

Cataract, in which the lens of the eye is opacified, is the major cause of blindness. This study will examine protein material of the lens called crystallins to try to determine what causes nuclear cataracts, a type of cataract that forms in the central lens nucleus. Men and women age 45 years or older with a cataract may be eligible for this study. Candidates will be screened to determine what type of cataract they have and will undergo a complete eye examination, including a vision test, eye pressure test, and examination of the lens and retina. Patients selected for study will have a complete physical and eye examination, including photography of various parts of the eye, and ultrasound measurements of the eye. They will then have cataract surgery, either with or without intraocular lens implantation, and will have follow-up examinations 1 week, 3 weeks, 5 weeks and 8 weeks after surgery. Tissue from the lenses removed during surgery will be given to NEI scientists for research on the causes of age-related nuclear cataracts.

Conditions

Cataract

Keywords

Cataract Surgery; Human Lens; Crystallins; Post-Translational; Protein Modification; Nuclear Cataract; Cataract Extraction

Eligibility Criteria

• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Patients with cataracts will be screened in order to determine eligibility.
• Patients 45 years and older of either sex with clinically significant cataract will be admitted to this study.
• Patients requiring cataract surgery should have either age related nuclear cataracts or cortical and/or posterior subcapsular cataract without nuclear cataract (controls).
• Age related nuclear cataract is defined using LOCS II Clinical Classification as having Nuclear color of 0-2, Nuclear Opalescence of 2-5, Cortical Opacity 0-1, and PSC 0-1.
• In addition, for controls, patients of either sex with clinically significant cortical or posterior subcapsular cataracts but having no nuclear cataract will also be recruited. These will have a LOCS grade of Nuclear Color 0-2, Nuclear Opalescence 0-1, Cortical 1-5, PSC 1.4.

Sponsors & Collaborators

• National Eye Institute (NEI): lead

Study Sites (1)

National Eye Institute (NEI)

Bethesda, Maryland, 20892, United States

Location

Related Publications (3)

• Datiles MB, Schumer DJ, Zigler JS Jr, Russell P, Anderson L, Garland D. Two-dimensional gel electrophoretic analysis of human lens proteins. Curr Eye Res. 1992 Jul;11(7):669-77. doi: 10.3109/02713689209000740.

  PMID: 1521468 BACKGROUND

• Foster A, Johnson GJ. Magnitude and causes of blindness in the developing world. Int Ophthalmol. 1990 May;14(3):135-40. doi: 10.1007/BF00158310. No abstract available.

  PMID: 2188914 BACKGROUND

• Dilley KJ. The proportion of protein from the normal and cataractous human lens which exists as high molecular weight aggregates in vitro. Exp Eye Res. 1975 Jan;20(1):73-8. doi: 10.1016/0014-4835(75)90109-8. No abstract available.

  PMID: 1193192 BACKGROUND

MeSH Terms

Conditions

Cataract

Condition Hierarchy (Ancestors)

Lens Diseases; Eye Diseases

Study Design

• Study Type: observational
• Sponsor Type: NIH

Study Record Dates

• First Submitted: November 3, 1999
• First Posted: November 4, 1999
• Study Start: May 1, 1997
• Study Completion: May 1, 2002
• Last Updated: March 4, 2008

Record last verified: 2002-05

Locations

US (1)