An Eye on Numbers: A Ready Reckoner in Ophthalmology by Dr. Anand Shroff

Author:Dr. Anand Shroff [Shroff, Dr. Anand]
Language: eng
Format: mobi
Publisher: Postscript Media Pvt. Ltd.
Published: 2011-11-15T16:00:00+00:00

- on margin of pupil 12 - 15°

- halfway between pupillary margin and limbus 25°

- on the limbus 45°

Maddox wing small degree of exophoria of 6-8 Δ is of no clinical significance

Titmus fly test presents a fly stereotest, horizontal disparity is presented via the vectographic technique measures gross stereopsis representing 3,000 secs of arc [at 40 cm the fly has a disparity of 3,600 sec of arc]

The disparity of the Wirt rings range from 800-40 sec of arc

9 sets of circles in the Titmus test provide horizontal disparity ranging from 800 to 20 secs of arc

10 sets of circles in the Randot test ranging from 800 to 20 secs of arc

3 rows of animals in both tests provide horizontal disparity of 400, 200 and 100 secs of arc

Distance stereopsis charts

A-O Vectographic Project-o-chart slide 4 rows of circles present horizontal disparity ranging from 240 to 60 seconds of arc

Contrast sensitivity

Levels of luminance used during contrast sensitivity testing

- Scotopic 5 cd/m2

- Normal indoor artificial illumination 85 cd/m2

- Outdoor sunshine 700 cd/m2

Peak contrast sensitivity of the visual system occurs at image sizes near 6 cycles/deg [=20/100 optotype]

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