← All decks
The first 25 slides, exactly as they appear. The full deck has 35 content slides.
Ophthalmology
Color Vision Defects
Built from Khurana — Neuro-Ophthalmology
What’s inside
5 sections · 35 slides
Overview
- What this talk will teach you
The Normal Colour Sense
From light to the experience of colour
- What colour vision actually is
- A short history of how we cracked colour
- The building blocks: rods vs cones
- Trichromacy: colour vision runs on three channels
- Two classic theories - and why both were partly right
- How the two theories fit together
- The genetics behind colour vision
Colour Vision Defects
Congenital vs acquired, and how to tell them apart
- Colour vision deficiency by the numbers
- Congenital colour vision defects: the basics
- Family one - Monochromasy: seeing the world in greys
- Dichromasy: one cone pigment entirely missing
- Anomalous trichromasy: a pigment shifted, not lost
- The three grades of congenital defect at a glance
- Acquired colour defects: colour loss from disease
- Congenital vs acquired - the distinguishing features
- Kollner's rule and a practical warning
- Clinical evaluation: assessing a colour defect
Testing for Colour Vision
Screening, grading, diagnosing and vocational tests
- Four families of colour test - each for a different job
- Plate (pseudoisochromatic) tests: the workhorse screen
- How a plate test actually works
- The Ishihara test in detail
- Who was Shinobu Ishihara, and why does his test dominate?
- Arrangement tests: grading the severity
- Anomaloscopes: the diagnostic gold standard
- Reading the anomaloscope - the tell-tale answers
- Lantern tests: can this person do the job?
Wrap-up
Key messages and references
- The essentials to carry away
- References
- Neuro-Ophthalmology