Reversible structural and functional changes after intraocular pressure reduction in patients with glaucoma

Area of Science:

• Ophthalmology
• Glaucoma Research
• Medical Imaging

Background:

• Glaucoma is a progressive optic neuropathy characterized by damage to the optic nerve.
• Intraocular pressure (IOP) is a major risk factor for glaucoma development and progression.
• Monitoring structural and functional changes is crucial for managing glaucoma.

Purpose of the Study:

• To assess structural and functional improvements after IOP reduction in glaucoma patients.
• To utilize Spectral Domain Optical Coherence Tomography (SD-OCT), Visual Field (VF) testing, and Visual Evoked Potentials (VEP) for evaluation.
• To correlate IOP changes with optic nerve and visual function recovery.

Main Methods:

• A study involving 76 eyes from 61 glaucoma patients.
• Patients were divided into acutely high (group 1) and mildly high (group 2) IOP groups, undergoing pressure-lowering interventions.
• Control group (group 3) had stable, lower IOP. SD-OCT, VF, and VEP tests were performed at baseline and three follow-up visits.

Main Results:

• Significant reduction in average cup to disc ratio observed in both intervention groups (p < 0.05).
• Significant reduction in cup volume in group 2 patients (p < 0.05).
• Visual field testing showed qualitative improvement in group 1 (p = 0.021), while VEP showed deterioration in high contrast latency for group 2 (p = 0.025).

Conclusions:

• IOP lowering interventions can lead to structural reversal of optic disc cupping in glaucoma.
• Functional improvements were indicated by VF testing, but not consistently detected by VEP.
• The degree of IOP reduction did not correlate with the observed structural changes.