Purpose:
-To determine if a smaller and shorter (32G, 4 mm) needle is more
optimal and preferred for intravitreal VEGF injections .
- Measure using ultrasound biomicroscopy (UBM) the distance from injection site in pars plana to the lens in a phakic patient
Methods:
A survey was performed by 5 injecting retinal specialist after completing 15 injections each (75 total)
1- Do you prefer the 4mm 32 gauge needle over the standard 1⁄2” 30 gauge needle?
2-Do you find that the 4mm 32gauge needle improves your ability to more accurately measure 4mm behind the limbus?
3-Would you consider switching to the 4mm 32 gauge needle as standard of care for intravitreal injections?
4-Did you encounter any complications, using the 4mm 32 gauge needle?
5-How important is the cost of the needle to you?

Results 
4 specialists preferred the 32G 4mm needle and considered switching to this needle. No complications were encountered. 
UBM of the angle showing that a 4 mm needle is safer to prevent lens trauma during intravitreal injections: measurement from injection site to lens is more than 4mm.

Conclusions:
-The majority of physicians enrolled in this study preferred the 32G 4mm needle for intravitreal injections and consider switching to this needle as standard of care.
-UBM images show that 4 mm needles are safer to prevent lens trauma in a phakic patient

Is a smaller needle (32G, 4mm) better for VEGF injections?

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