scholarly journals Glaucoma suspect & Humphrey Field Analyzer a correlation

2012 ◽  
Vol 8 (1) ◽  
pp. 23-28
Author(s):  
P Dahal ◽  
AP Rizal ◽  
DB Karki
Keyword(s):  
Visual Field ◽  
Visual Field Loss ◽  
Neural Retina ◽  
Medical Sciences ◽  
Significant Relation ◽  
Glaucoma Suspect ◽  
Humphrey Field Analyzer ◽  
Elevated Intraocular Pressure ◽  
Normal Visual Field ◽  
Primary Risk Factor

Glaucoma originally meant "clouded", in Greek.The term glaucoma refers to a group of diseases that have in common characteristic optic neuropathy with associated visual field loss for which elevated intraocular pressure is one of the primary risk factor. The purpose of the study is to correlate the clinically diagnosed cases of glaucoma suspect with the Humphrey Field Analyzer (HFA). Fifty cases of glaucoma suspect who attended the glaucoma clinic of Nepal Eye Hospital Tripureswor, Kathmandu, Nepal and who meets at least two criteria, among the four types of glaucoma suspects were advised for the HFA for the study. In this study out of 50 patient, 36 (72%) patients had normal visual field. 14 (28%) patients had thinning of the neural retinal rim (NRR) in both eyes. The significant relation with thinning of neural retina rim and glaucomatous hemifield test was found in the study. Journal of College of Medical Sciences-Nepal,2012,Vol-8,No-1, 23-28 DOI: http://dx.doi.org/10.3126/jcmsn.v8i1.6822

Design of Experiments for Exposure of Astrocytes to Elevated Hydrostatic Pressure and Hypoxia

2008 ◽  
Author(s):  
Shadi Rajabi ◽  
Craig A. Simmons ◽  
C. Ross Ethier
Keyword(s):  
Intraocular Pressure ◽  
Visual Field ◽  
Retinal Ganglion Cells ◽  
Vision Loss ◽  
Ganglion Cells ◽  
Visual Field Loss ◽  
Retinal Ganglion ◽  
Common Cause ◽  
Elevated Intraocular Pressure

Glaucoma, a chronic optic neuropathy, is the second most common cause of blindness, affecting 67 million people worldwide. The damage in glaucoma occurs at the optic nerve head (ONH), where the axons of the retinal ganglion cells leave the eye posteriorly. Glaucoma is frequently associated with elevated intraocular pressure (IOP), and visual field loss can be prevented by significant lowering of IOP. Hence, the role of pressure in glaucoma is important. Unfortunately, the mechanism by which pressure leads to vision loss in glaucoma is very poorly understood.

The Normal Visual Field on the Humphrey Field Analyzer

1986 ◽  
Vol 193 (1-2) ◽  
pp. 56-74 ◽  
Author(s):  
Randall S. Brenton ◽  
Charles D. Phelps
Keyword(s):  
Visual Field ◽  
Humphrey Field Analyzer ◽  
Normal Visual Field

scholarly journals Retinal Nerve Fiber Layer Atrophy Is Associated With Visual Field Loss Over Time in Glaucoma Suspect and Glaucomatous Eyes

2013 ◽  
Vol 155 (1) ◽  
pp. 73-82.e1 ◽  
Author(s):  
Mitra Sehi ◽  
Xinbo Zhang ◽  
David S. Greenfield ◽  
YunSuk Chung ◽  
Gadi Wollstein ◽  
...  
Keyword(s):  
Visual Field ◽  
Nerve Fiber ◽  
Retinal Nerve Fiber Layer ◽  
Visual Field Loss ◽  
Fiber Layer ◽  
Glaucoma Suspect ◽  
Nerve Fiber Layer ◽  
Over Time ◽  
Retinal Nerve Fiber

SITA-Standard perimetry has better performance than FDT2 matrix perimetry for detecting glaucomatous progression

2018 ◽  
Vol 102 (10) ◽  
pp. 1396-1401
Author(s):  
Michael Wall ◽  
Chris A Johnson ◽  
K D Zamba
Keyword(s):  
Visual Field ◽  
Visual Field Loss ◽  
Detection Algorithm ◽  
Data Series ◽  
Automated Perimetry ◽  
Standard Automated Perimetry ◽  
Full Data ◽  
Visual Field Progression ◽  
Standard Testing ◽  
Humphrey Field Analyzer

PurposeThe Humphrey Matrix (FDT2) may be more sensitive in detecting glaucomatous visual field loss than SITA standard automated perimetry (SAP) performed on the Humphrey Field Analyzer (HFA). Therefore, FDT may be a good candidate to determine disease progression in patients with glaucoma. Our aim was to test the hypothesis that automated perimetry using the FDT2 would be equal to, or more effective than, HFA SITA-Standard, in identifying glaucomatous progression.MethodsOne hundred and twenty patients with glaucoma were tested twice at baseline and every 6 months for 4 years with HFA SITA-Standard and FDT2. FDT2 values were standardised to HFA SAP values. We used pointwise linear regression (PLR) over the full data series to identify glaucomatous progression and generated an array of results using three different criteria: (1) three or more clustered test locations progressing, (2) three or more non-clustered test locations progressing and (3) total number of progressing test locations. We compared HFA SAP and FDT2 for the number of locations signalled by the PLR detection algorithm.ResultsRegardless of the criteria, HFA SAP with SITA-Standard testing detected visual field progression at a higher rate than the FDT2 overall (P<0.001).ConclusionHFA SAP identifies glaucomatous visual field progression at a rate at least as high if not higher than FDT2.

scholarly journals What do patients with glaucoma see: a novel iPad app to improve glaucoma patient awareness of visual field loss

2020 ◽  
pp. bjophthalmol-2020-317034
Author(s):  
Meghal Gagrani ◽  
Jideofor Ndulue ◽  
David Anderson ◽  
Sachin Kedar ◽  
Vikas Gulati ◽  
...  
Keyword(s):  
Visual Field ◽  
Vision Loss ◽  
Peripheral Vision ◽  
Glaucoma Patient ◽  
Visual Field Loss ◽  
Sensitivity Threshold ◽  
Roc Curve Analysis ◽  
The Mean ◽  
Ipad App ◽  
Field Defects

PurposeGlaucoma patients with peripheral vision loss have in the past subjectively described their field loss as ‘blurred’ or ‘no vision compromise’. We developed an iPad app for patients to self-characterise perception within areas of glaucomatous visual field loss.MethodsTwelve glaucoma patients with visual acuity ≥20/40 in each eye, stable and reliable Humphrey Visual Field (HVF) over 2 years were enrolled. An iPad app (held at 33 cm) allowed subjects to modify ‘blur’ or ‘dimness’ to match their perception of a 2×2 m wall-mounted poster at 1 m distance. Subjects fixated at the centre of the poster (spanning 45° of field from centre). The output was degree of blur/dim: normal, mild and severe noted on the iPad image at the 54 retinal loci tested by the HVF 24-2 and was compared to threshold sensitivity values at these loci. Monocular (Right eye (OD), left eye (OS)) HVF responses were used to calculate an integrated binocular (OU) visual field index (VFI). All three data sets were analysed separately.Results36 HVF and iPad responses from 12 subjects (mean age 71±8.2y) were analysed. The mean VFI was 77% OD, 76% OS, 83% OU. The most common iPad response reported was normal followed by blur. No subject reported dim response. The mean HVF sensitivity threshold was significantly associated with the iPad response at the corresponding retinal loci (For OD, OS and OU, respectively (dB): normal: 23, 25, 27; mild blur: 18, 16, 22; severe blur: 9, 9, 11). On receiver operative characteristic (ROC) curve analysis, the HVF retinal sensitivity cut-off at which subjects reported blur was 23.4 OD, 23 OS and 23.3 OU (dB).ConclusionsGlaucoma subjects self-pictorialised their field defects as blur; never dim or black. Our innovation allows translation of HVF data to quantitatively characterise visual perception in patients with glaucomatous field defects.

Sign in / Sign up

Export Citation Format

Share Document