Using the slit lamp can be a challenge to learn, especially if you haven’t seen pathology before. In checking for anterior uveitis (i.e. iritis), you need to look for “cell and flare”. In theory, you know that you are looking for inflammatory cells and “flare”, which resembles a light beam being filtered through smoke.
“Cell and flare” on slit lamp
There is a fantastic educational video from www.RootAtlas.com demonstrating what “cell and flare” looks like and some tips to improve your slit lamp exam.