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Related Experiment Videos

Iris ischaemic changes and visual outcome after acute primary angle closure.

Seng-Chee Loon1, Paul T K Chew, Francis T S Oen

  • 1National University Hospital, Singapore.

Clinical & Experimental Ophthalmology
|September 27, 2005
PubMed
Summary

Iris ischaemic changes after acute primary angle closure (APAC) do not appear to negatively impact long-term vision. This study found no significant difference in visual acuity or visual fields in patients with or without these changes.

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Area of Science:

  • Ophthalmology
  • Glaucoma Research
  • Iris Physiology

Background:

  • Acute primary angle closure (APAC) frequently causes iris ischaemic changes.
  • Understanding the visual outcome significance of these changes is crucial for patient management.

Purpose of the Study:

  • To investigate the significance of iris ischaemic changes (IIC) on visual outcome after APAC.
  • To assess the relationship between IIC and visual acuity and visual fields post-treatment.

Main Methods:

  • Patients with APAC received medical therapy followed by laser peripheral iridotomy.
  • Iris ischaemic changes (defined as whorling or atrophy) were monitored post-procedure.
  • Visual acuity and visual fields were assessed at 16 weeks, excluding those requiring further glaucoma intervention.

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Main Results:

  • Over half (52.5%) of APAC patients developed IIC, with many showing signs within the first week.
  • No statistically significant difference in abnormal visual field defects was observed between groups with and without IIC at 16 weeks (P = 0.09).
  • Visual acuity at 16 weeks was comparable, with most patients in both groups achieving 6/12 or better.

Conclusions:

  • Iris ischaemic changes following a single episode of APAC may not be linked to poor visual outcomes.
  • The presence of IIC does not appear to adversely affect visual acuity or fields in the long term.