This site is in the middle of a major expansion. It was originally designed as a resource for vision professionals who wanted to better understand how to care for patients with vision impairments. I'm now reworking the site with content for the general public — people with low vision and people who want to know more about low vision. Once that section is complete, I'll rework the section for vision professionals to better integrate with the general public section. Keep checking back to see how it's going, and if you find the content helpful please consider contributing to support the effort.


1.1 Introduction

1.2 We all experience low vision

1.3 Don't believe the VA

1.4 Contrast Sensitivity

1.5 Patchy Visual Fields

1.6 VA and Patchy Macular Fields

1.7 Patchy Visual Fields and Reading Fluency

1.8 Face Recognition

2.0 Two Dimensions: The Contrast Sensitivity Function

2.1 The CSF in Low Vision

2.2 The CSF and Magnifiers

2.3 The CSF and Luminance

3.0 Contrast and Luminance

3.1 Low Vision in the Visual Volume

3.2 Plotting Text in the Visual Volume

3.3 Plotting Test in a Low Vision VV

3.4 The Brightness Sensitivity Function

3.5 Comparing BSFs for Different Documents

3.6 LVAs in the BSF

3.7 LVAs in the 3D Visual Volume

4.0 Fluent Reading: The 'Hard Problem'

4.1 Reserves and the Optimal Visual Volume

4.2 The OVV in AMD (in theory)

4.3 The OVV in AMD (in reality)

4.4 Measuring the OVV Empirically

5.0 Achieving Fluent Reading — Attempt #1

5.1 Magnification: A Double-Edged Sword

5.2 Line Length and Reading Fluency

5.3 LVA Speed Limits

5.4 Achieving Reading Fluency — Attempt #2

5.5 My Low Vision Exam Routine

6.0 Macular Hole

6.1 Ring Scotomas

6.2 Achromatopsia

6.3 Glaucoma and Diabetic Retinopathy

7.0 My Favourite Reading Magnifiers