Hess Charting is a diagnostic technique used to assess the ocular motility and alignment of the eyes, particularly for detecting and evaluating disorders related to strabismus (misalignment of the eyes), eye muscle function, and binocular vision problems. The procedure involves using a specialized chart with a grid that includes targets representing different positions of gaze, which the patient is asked to focus on.
The Hess chart consists of a series of light targets on a grid, and the patient is instructed to follow these targets in different directions while their eye movements are tracked. The chart helps the clinician evaluate the degree of deviation in the eye movements, such as when one eye fails to properly align with the other or when there is a restriction in movement due to muscle weakness or other abnormalities. It provides valuable information about the function of the extraocular muscles, which control eye movement.
Hess charting is an important tool for assessing conditions such as paralytic strabismus (where one or more eye muscles are paralyzed), restrictive strabismus (where the movement of one or both eyes is limited), and for planning surgical interventions when needed. The procedure is non-invasive and can be performed in a clinical setting without the need for sedation.
Medical Equipment Needed for Hess Charting
Hess Chart (or a similar grid with light targets)
Hess Chart Projector (optional for enhanced visibility)
Fixation Targets (e.g., small light or dots)
Infrared Ocular Movement Tracking System (optional, for more precise measurement)
Slit Lamp (for detailed examination of eye alignment)
Patient Chair (to ensure proper positioning for test)
Pupil Dilation Drops (if needed for better visualization)
Measuring Calipers (for assessing the degree of eye deviation)
Recording Sheets or Software (for documenting and analyzing results)
Eye Shield (if needed during examination for protection)
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