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Nummular dystrophic calcification of an Ahmed glaucoma valve in a child

Arif O Khan1, Hind Al-Katan, Deepak P Edward

  • 1Division of Pediatric Ophthalmology, King Khaled Eye Specialist Hospital, Riyadh, Saudi Arabia. arif.khan@mssm.edu

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus
|July 25, 2012
PubMed

Insights

This case study describes the first instance of calcium deposits on an Ahmed glaucoma valve in a child with primary congenital glaucoma. These deposits were found on the dorsal plate of the glaucoma drainage device.

Area of Science:

  • Ophthalmology
  • Biomaterials Science

Background:

  • Primary congenital glaucoma is a rare condition requiring surgical intervention.
  • Glaucoma drainage devices, such as the Ahmed glaucoma valve, are used to manage intraocular pressure.
  • Complications can arise from ophthalmic implants, necessitating further investigation.

Observation:

  • A 4.5-year-old girl with primary congenital glaucoma presented with increased intraocular pressure despite a previously implanted Ahmed glaucoma valve.
  • Surgical intervention revealed multiple nummular calcium deposits on the dorsal plate of the Ahmed glaucoma valve.
  • Histopathological examination and X-ray microanalysis confirmed the presence of calcium deposits.

Findings:

  • This is the first reported case of calcium deposits specifically on an Ahmed glaucoma valve.
  • The calcium deposits were located on the dorsal plate of the device.
  • The presence of these deposits did not appear to be directly related to the initial failure of the device.

Implications:

  • The findings suggest that calcium deposition is a potential, previously undescribed complication of glaucoma drainage devices.
  • Further research is warranted to understand the mechanism and clinical significance of calcium deposits on glaucoma valves.
  • This observation may inform the design and material selection for future ophthalmic implants.

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