This lecture introduces cryosurgery for optometric surgeons, focusing on cryobiologic principles and mechanical factors that enable predictable tissue destruction. Participants will explore mechanisms of cryo-induced cellular injury and death, the impact of cooling rates, freeze times, and thawing dynamics, and how equipment choice and technique influence outcomes. The session provides a scientific and technical foundation for the safe, effective, and reproducible use of cryosurgical procedures in periocular and adnexal disease management.
Learning Objectives:
Upon conclusion of this activity, attendees will be able to:
Differentiate between cryobiology, cryotherapy, and cryosurgery, and explain how cryosurgery achieves irreversible tissue destruction through direct and indirect cellular mechanisms.
Describe the primary mechanisms of cryo-induced tissue injury and cell death, including intracellular ice formation, solution effects, protein denaturation, vascular compromise, necrosis, apoptosis, and necroptosis.
Analyze the key procedural parameters—cooling rate, tissue end temperature, freeze duration, and thaw rate—and their effects on the width, depth, and circumscription of the cryogenic lesion.
Identify essential cryosurgical equipment and optometric cryo techniques, and explain how nozzle design, spray distance, tip diameter, and probe orientation influence isotherm patterns and clinical outcomes.
