What mean deviation progression rate is clinically significant?

MD progression rate > -0.5 dB/year is significant; fast progression > -2 dB/year warrants urgent IOP reduction; slow progression < -0.5 dB/year may be acceptable in elderly patients with mild disease; 5+ VF tests needed for reliable regression.

How many visual field tests are needed to detect progression?

Linear regression requires minimum 5-6 tests for reliable slope estimation; 2 tests within the first 2 years then annual; Bayesian Change Point Analysis can detect progression with fewer tests but requires software.

What is the VFI (Visual Field Index) in Humphrey perimetry?

VFI is a global VF summary measure (0-100%: 100% = normal, 0% = perimetrically blind) that is age-corrected and less sensitive to cataract than MD; VFI rate of loss in %/year is used to predict functional blindness.

What defines rapid glaucoma progression?

Rapid progression: MD decline > -2 dB/year, VFI decline > -5%/year, RNFL thinning >2 μm/year on OCT; such rates warrant maximum medical or surgical therapy; lifetime blindness risk is primary factor in treatment decisions.

When is filtering surgery indicated for glaucoma?

Trabeculectomy or tube shunt indicated when IOP target not achieved with maximum tolerated medical therapy; significant VF progression despite adequate IOP control; poor compliance with drop regimen; 180-360° laser trabeculoplasty (SLT) often precedes surgery.

Glaucoma Visual Field Progression Rate Calculator

Calculates visual field mean deviation progression rate (dB/year) using linear regression of serial Humphrey VF tests, estimates time to functional blindness, and guides IOP lowering intervention urgency.

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