Indirect funduscopy in a gas filled eye: an observation

Area of Science:

• Ophthalmology
• Optical Physics
• Medical Imaging

Background:

• Intraocular gas injection is common in vitreoretinal surgery.
• The optical properties of the eye are altered by vitrectomy and gas tamponade.

Purpose of the Study:

• To describe and explain the optical phenomenon of aerial fundus image formation in a gas-filled, vitrectomized eye.
• To analyze the conditions under which this image is produced and its characteristics.

Main Methods:

• Observational analysis of image formation in a post-vitrectomy eye with intraocular gas.
• Theoretical optical modeling to explain the observed aerial image.

Main Results:

• A real, inverted aerial image of the ocular fundus is formed anterior to the cornea.
• The image is produced due to the refractive properties of the gas bubble and the remaining ocular structures.

Conclusions:

• The presence of intraocular gas following vitrectomy can lead to the formation of an aerial fundus image.
• Understanding this optical effect is important for ophthalmic imaging and surgical assessment.