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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Crystalline coloboma.

R Demetrio1, D Ruiz-Sancho1, N Rolón1

  • 1Servicio de Oftalmología, Hospital Universitario Marqués de Valdecilla, Santander, España.

Archivos De La Sociedad Espanola De Oftalmologia
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

This case report details a 73-year-old female diagnosed with lens coloboma during cataract surgery. The study highlights the clinical diagnosis and variable visual prognosis of this congenital eye defect.

Keywords:
Anillo de tensión capsularCapsular tension ringCataractCatarataColobomaCristalinoCrystallineLens

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Area of Science:

  • Ophthalmology
  • Medical Genetics

Background:

  • Lens coloboma is a congenital defect of the eye, often associated with other ocular anomalies.
  • The incidence varies globally, with higher rates reported in China compared to European countries and the United States.

Observation:

  • A 73-year-old female patient was diagnosed with lens coloboma during preoperative evaluation for cataract surgery.
  • The diagnosis of lens coloboma is primarily clinical, based on the characteristic appearance of the defect.

Findings:

  • The patient underwent successful cataract surgery using phacoemulsification with an intraocular lens and a capsular tension ring.
  • Visual prognosis in cases of coloboma is contingent upon the defect's extent and severity.

Implications:

  • This case underscores the importance of recognizing lens coloboma, even in older patients presenting for cataract surgery.
  • Understanding the clinical presentation and prognosis of lens coloboma aids in patient counseling and management strategies.