Purpose The purpose of this master thesis was to study Demodex via a case study. The aim was to figure out the need for treatment of a symptom-free client with signs of cylindrical dandruff associated with Demodex blepharitis.

Methods This single case study report involved the clinical assessment and management of a 57-years old Finnish male who went to a privately owned optical shop for an eye examination. The survey was based on different treatment methods and their impact on Demodex, consisting of six return visits. The survey was done from 21.07-14.10.22, and the research method was qualitative. The researcher collected all data on-site while the patient was being seen in the clinic. Therefore, a separate IRB approval was not needed. The primary literature search was conducted in April 2022 from PubMed with the keywords Demodex blepharitis, and nine studies were used.

Results One week of use of Blephasolduo gave a cleaner edge to the eyelid, but the CD did not disappear and decreased minimally. The first two weeks of using Blephademodex proved to be inefficient. But after four weeks, there was an apparent change. Then again, at six weeks, the result had stagnated with no progress. After eight weeks of total treatment of the eyelids, there was still CD left, which is why Blephex cleaning was chosen as the treatment method. This resulted in CD-free eyelashes. After that, there was a 4-week follow-up period with the use of routine eyelid cleansing morning and evening. After this period, the client had a relapse of CD.

Conclusions Blephasol duo should be used as a preventive product for cleaning the eyes. It should not be used as a single product once the mites have invaded. It can be used in conjunction with Blephademodex. Using Blephademodex once a day looks like a long-term process, even if the client has no symptoms. Recommend direct use twice daily. For an even faster result, first, BlephEX will remove all CD and any mites in them and then more effectively get Blephademodex into the follicle and meibomian glands. Recommends treatment of symptom-free Demodex clients to avoid sequelae on the conjunctiva, cornea, etc. The optometrist should inform the client about Demodex during a routine eye examination.

Keywords: demodex blepharitis, blepharitis, anterior blepharitis, posterior blepharitis, demodex treatment, demodex management.