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Updated: Feb 16, 2026
An Alternative and Validated Injection Method for Accessing the Subretinal Space via a Transcleral Posterior Approach
Published on: December 7, 2016
Intravitreal injection of polysorbate 80: a functional and morphological study
Francisco Max Damico1, Fábio Gasparin1, Gabriela Lourençon Ioshimoto2
1- USP Medical School, Department of Ophthalmology and Otolaryngology, São Paulo, SP, Brazil.
Objective:
to determine the functional and morphological effects at rabbits retina of PS80 concentration used in the preparation of intravitreal drugs.
Methods:
eleven New Zealand rabbits received a intravitreal injection of 0.1ml of PS80. As control, the contralateral eye of each rabbit received the same volume of saline. Electroretinography was performed according to a modified protocol, as well as biomicroscopy and retina mapping before injection and seven and ten days after. Animals were euthanized in the 30th day and the retinas were analyzed by light microscopy.
Results:
eyes injected with PS80 did not present clinical signs of intraocular inflammation. Electroretinography did not show any alteration of extent and implicit time of a and b waves at scotopic and photopic conditions. There were no morphological alterations of retinas at light microscopy.
Conclusion:
intravitreal injection of PS80 in the used concentration for intravitreal drug preparations do not cause any functional or morphological alterations of rabbit retinas. These results suggest that PS80 is not toxic to rabbit retinas and may be safely used in the preparation of new lipophilic drugs for intravitreal injection.
