Technical Report: Reducing Lens Fogging Associated with Patient Mask Wearing with Heated Diagnostic Fundoscopy Lenses.

Significance: Severe acute respiratory syndrome coronavirus 2 has indirectly created challenges to the ophthalmic retinal examinations because of lens fogging related to patients wearing masks. To date, there are no objective data on the degree of diagnostic ophthalmic lens fogging associated with mask wearing or on the effectiveness of proposed solutions to ophthalmologic lens fogging.

Purpose: The purposes of this study were to investigate the degree of ophthalmologic lens fogging in patients wearing masks and to assess the efficacy lens warming in reducing lens fogging and facilitating ophthalmologic retinal examinations.