Scleral spur | definition of scleral spur by Medical dictionary
Also found in: Dictionary
scleral spur [TA]
circular ridge of sclera on the internal aspect of the corneoscleral junction; on cross-section, it appears as a hooklike process deep to the scleral venous sinus; relatively rigid, it provides attachment for the meridional fibers of the ciliary body.
scle·ral spur (skērăl spŭr) [TA]
Scleral fibers bordered anteriorly by the canal of Schlemm and the trabecular meshwork and posteriorly by the ciliary muscle fibers.
A ridge of the sclera at the level of the limbus interposed between the posterior portion of Schlemm's canal and the anterior part of the ciliary body. The scleral spur is the structure to which some of the ciliary muscle fibres are attached. See gonioscopy
; internal scleral sulcus
References in periodicals archive
Table 1 Shaffer grading interpretation Clinical Shaffer angle Grade Structures visible interpretation 35-45[degrees] 4 Ciliary body Closure impossible at present 25-35[degrees] 3 Scleral spur
Closure impossible at present 20[degrees] 2 Pigmented TM Closure possible but unlikely 10[degrees] 1 Non-pigmented TM Closure not inevitable but risk is high 0[degrees] 0 None Closed Table 2 Estimation of AC depth compared to corneal van Herick Foster's modified thickness grading grading >0.
Grade 3 (25-35 degrees): the angle is such that at least the scleral spur
can be identified.
It is important for the device to enter the eye exactly at the anterior aspect of the scleral spur
and for it to remain at the iris plane so that it does not point downward towards the iris.