Visual field Pointwise Analysis of the Idiopathic Intracranial Hypertension Weight Trial (IIH:WT)

Susan Mollan, Samuel Bodoza, Áine Ní Mhéalóid, James Mitchell, Neil R. Miller, Giovanni Montesano, David P Crabb, Michael Wall, Kristian Brock, Alex Sinclair*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Downloads (Pure)

Abstract

Purpose: This study was designed to determine if point analysis of the Humphrey visual field (HVF) is an effective outcome measure for people with idiopathic intracranial hypertension (IIH) compared with mean deviation (MD).

Methods: Using the IIH Weight Trial data, we performed a pointwise analysis of the numerical retinal sensitivity. We then defined a medically treated cohort as having MDs between −2 dB and −7 dB and calculated the number of points that would have the ability to change by 7 dB.

Results: The HVF 24-2 mean ± SD MD in the worse eye was −3.5 ± 1.1 dB (range, −2.0 to −6.4 dB). Total deviation demonstrated a preference for the peripheral and blind spot locations to be affected. Points between 0 dB and −10 dB demonstrated negligible ability to improve, compared with those between −10 dB and −25 dB. For the evaluation of the feasibility for a potential medical intervention trial, only 346 points were available for analysis between −10 dB and −25 dB bilaterally, compared with 4123 points in baseline sensitivities of 0 to −10 dB.

Conclusions: Patients with IIH have mildly affected baseline sensitivities in the visual field based on HVF analyzer findings, and the majority of points do not show substantial change over 24 months in the setting of a randomized clinical trial. Most patients with IIH who are eligible for a medical treatment trial generally have the mildest affected baseline sensitivities. In such patients, pointwise analysis offers no advantage over MD in detection of visual field change.
Original languageEnglish
Article number1
Number of pages11
JournalTranslational Vision Science & Technology
Volume12
Issue number5
DOIs
Publication statusPublished - 1 May 2023

Keywords

  • visual field
  • point sensitivity
  • idiopathic intracranial hypertension
  • pseudotumor cerebri
  • perimetric mean deviation

Fingerprint

Dive into the research topics of 'Visual field Pointwise Analysis of the Idiopathic Intracranial Hypertension Weight Trial (IIH:WT)'. Together they form a unique fingerprint.

Cite this