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The barrier function in extracapsular cataract surgery.
R T Smith1, C J Campbell, C J Koester
1Edward S. Harkness Eye Institute, Columbia Presbyterian Medical Center, New York.
Ophthalmology
|January 1, 1990
Summary
Extracapsular cataract extraction (ECCE) with intact capsule shows less fluorescein penetration into the anterior vitreous compared to intracapsular cataract extraction (ICCE). This suggests ECCE may create a barrier to posterior molecule movement in the eye.
Area of Science:
- Ophthalmology
- Ocular Physiology
- Pharmacokinetics
Background:
- Cataract surgery techniques, extracapsular cataract extraction (ECCE) and intracapsular cataract extraction (ICCE), differ in their impact on ocular barriers.
- Understanding the permeability of the blood-aqueous barrier after different cataract surgeries is crucial for predicting drug delivery and inflammatory responses.
Purpose of the Study:
- To compare the distribution of fluorescein between the anterior chamber and anterior vitreous in patients who underwent ECCE versus ICCE.
- To assess the influence of surgical technique on the permeability of ocular barriers to systemically administered molecules.
Main Methods:
- Oral administration of fluorescein to two groups of patients: ECCE with posterior chamber intraocular lens (PC IOL) and ICCE with anterior chamber intraocular lens (AC IOL).
- Measurement of fluorescein concentrations using fluorophotometry.
- Calculation of fluorescein penetration ratios to quantify movement into the anterior vitreous.
Main Results:
- Significantly lower fluorescein penetration ratios were observed in the ECCE group (2.03 x 10(-3) min-1) compared to the ICCE group (5.99 x 10(-3) min-1).
- This indicates a reduced passage of fluorescein from the anterior chamber to the anterior vitreous in ECCE patients.
Conclusions:
- Extracapsular cataract extraction with an intact capsule creates a more significant barrier to the posterior movement of molecules compared to intracapsular cataract extraction.
- This finding has implications for understanding the transport of other molecules, such as prostaglandins, into the posterior segment of the eye after cataract surgery.