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Adler's physiology text states, "In man, the appearance of the capillaries and arterioles in the conjunctiva vary so... that caution must be observed in connecting any changes with a particular disease or even of interpreting them as indicating a diseased state."
In this monograph, the authors have observed this caution and present 108 enlarged close up photographs of the conjunctival vessels in addition to photographs of the vessels of the nail bed and tongue.
They have documented the normal appearance of the conjunctiva and its variations as well as the appearance of petechiae, micropools, sacculations, intravascular red cell aggregation, and vessel caliber changes in systemic vascular disease. They have found the symptom complex of acrocyanosis to be accompanied by a typical color change in the conjunctival vessels. Their conclusion, that capillary microscopy gives insight into the dynamic state of the small vessels of the body seems justified by their photographs.
Trokel S. Clinical Capillary Microscopy. Arch Ophthalmol. 1967;77(6):842. doi:10.1001/archopht.1967.00980020844023
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