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Braidon Beard (left) and Corbin Brannon working in computer lab on Pittsburg State Campus in Pittsburg Kansas on April 3,2018
Diffuse lamellar keratitis starting at the periphery of the LASIK flap and progressing to the centre of the visual axis.
© Vineet Joshi CC BY-NC-SA 4.0
The LED is a nice SMD LED that I bought in Shanghai from Luckylight. They make nice LEDs, although surface mount was a pain to deal with using a 1$ 'firestarter' soldering iron and random cable.
A plastic container from one of those delicious tiny asian jelly snacks works as a water seal and diffuser. I used a glue gun to fill it halfway, then threw it in the freezer for a bit.
Pro tip: This is better than the traditional ping-pong ball diffuser because of the flat bottom. Use one in your next project! IF it fails you still have a nice snack, too.