9 Glaucoma


Ciliary body (CB)

6-mm-wide structure located between the scleral spur anteriorly and the ora serrata posteriorly; composed of the pars plicata (anterior 2 mm with ciliary processes) and the pars plana (posterior 4 mm, flat)

Pars plicata consists of


Angle Structures

Visible only by gonioscopy because of total internal reflection at the air/cornea interface (Figure 9-1)

Angle Abnormalities



IOP measurement can be performed with a variety of devices (tonometers)


Visual Fields

Perimetry measures the ‘island of vision’ or topographic representation of differential light sensitivity. Peak = fovea; depression = blind spot; extent = 60° nasally, 60° superiorly, 70–75° inferiorly, and 100–110° temporally

Central field tests points only within a 30° radius of fixation

Humphrey (static)

Optic Nerve Head (ONH) Analyzers

Various digital and video cameras that capture ONH image; computer then calculates cup area in an attempt to objectively quantify ONH appearance (Table 9-1)


Jun 4, 2016 | Posted by in OPHTHALMOLOGY | Comments Off on Glaucoma

Full access? Get Clinical Tree

Get Clinical Tree app for offline access