Capabilities of remote laser homeostasis of the conjunctiva and sclera

Abstract

During some eye surgeries, a need for hemostasis can arise in order to prevent bleeding. To determine the optimal settings for remote laser action of Nd:YAG laser with a wavelength of 1.44 µm on the conjunctival and episcleral vessels of the eye to stop bleeding, as well as for preemptive anemisation of tissue prior to performing a surgical incision. The characteristics of the laser impact on vessels of the conjunctiva and sclera were studied clinically while conducting surgeries on 36 patients for cataract, glaucoma and excision of pterygium. The best mode of operation of Nd:YAG laser for remote laser anaemisation of the area of planned cut were 1.44 µm wavelength with 5 Hz frequency and energy of 100 mJ. Remote hemostasis can be achieved with the following settings for energy parameters: for pulse frequency of 5 Hz - pulse energy from 150 to 200 mJ; for pulse frequency of 10 Hz and 15 Hz - energy from 100 to 150 mJ; for pulse frequency of 25 Hz - energy not exceeding 100 mJ. No scar remained after the action of 1.44-µm Nd:YAG laser, and recanalization of individual vessels was possible.