scleral rigidity

scle·ral ri·gid·i·ty

the resistance of the eye to changes in shape with changes in intraocular pressure.
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Surgeon must be aware of the following factors before taking on surgery in such compromised eyes: conjunctival scarring, low endothelial cell counts, poor pupillary dilatation, increased lens-iris diaphragm retropulsion, zonular weakness and pre-existing posterior capsular damage as well as diabetic retinopathy, low scleral rigidity, cystoid macular edema and other co-morbidities.
The amount of reflux occurring after IVB depends on various factors, including baseline IOP, scleral rigidity, the degree of liquefaction of the vitreous and the presence of a posterior vitreous detachment.
Numerous factors influence the IOP measurement, especially central corneal thickness (CCT), corneal curvature, scleral rigidity, patient positioning at the slit lamp, direction of gaze [7], and the technique used for the measurement.
The scleral rigidity may actually affect IOP assessment.
Evidence has been presented previously to support the view that the concept of corneo- scleral rigidity should be largely, if not completely, replaced by variations in ocular volume or, more accurately, variations in surface area of the corneoscleral envelope.
Leakage from sclerotomies is more likely in highly myopic eyes with low scleral rigidity, in eyes with scarred conjunctiva or sclera from previous surgery, in Marfan's syndrome [36], and in young children [19].