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Intrastromal injection techniques and approach to the cornea when using a small-gauge needle (A) or a depth-defined PCI microneedle (B). Injections using the small-gauge needle, such as a 31-G needle (A), generally require the use of magnification such as an operating microscope by the user. The PCI microneedle (B) can be used for intrastromal injection without user magnification.
