Final answer:
When performing a Penlight Direct Ophthalmoscopy (PDO) examination on individuals with strabismus, it is important to patch the eye not being observed to ensure proper fixation and alignment.
Step-by-step explanation:
When conducting a Penlight Direct Ophthalmoscopy (PDO) examination on subjects with strabismus, it is important to make sure that the eye not being observed is covered, or 'patched'. This ensures that the subject is fixating with the eye under observation and that it is not turned unless there is eccentric fixation present.
This technique helps in assessing the alignment and movement of the eyes and can be used to identify any abnormalities or deviations in eye coordination and focusing abilities.