• Conjunctival capillary fragility (CCF) and skin capillary fragility (SCF) were studied by a negative-pressure suction cup method in 25 normal subjects and 38 diabetic patients with diabetic retinopathy. The CCF was significantly higher (P < .001) in patients with diabetic retinopathy than in normal subjects; there was no significant difference in the SCF.
Chandra SR, McMeel JW, Field RA. Conjunctival Capillary FragilityA Preliminary Study. Arch Ophthalmol. 1979;97(4):749-751. doi:10.1001/archopht.1979.01020010401026