What is the proper order of visual acuity measurements?

• A. Form Recognition, Hand Motion, Light Projection, Light Perception, No Light Perception
• B. Form Recognition, Light Projection, Hand Motion, Light Perception, No Light Perception
• C. Form Recognition, Hand Motion, Light Perception, Light Projection, No Light Perception
• D. Form Recognition, Hand Motion, Light Projection, No Light Perception, Light Perception

Answer: (A)

When assessing very limited vision, the test sequence moves from tasks that require more complex processing to those that rely on minimal light sensitivity. Starting with form recognition checks whether the person can identify shapes or letters at distance, which reflects a higher level of visual function. If that isn’t possible, the next step is to see if movement can be detected—hand motion testing—indicating a still-useful level of visual awareness. If movement isn’t detectable, the tester then looks at light-related abilities: first whether the person can localize the light source, called light projection, which shows a more functional residual vision than simply noticing light. If even that isn’t possible, the next step is light perception, meaning the person can sense that light is present but cannot localize it. The final category is no light perception, indicating no light awareness at all. This order provides a standardized way to document incremental residual vision and guides planning for rehabilitation.

Other sequences would misrepresent the relative capabilities; for example, placing light perception before light projection would imply being able to sense light without any ability to localize it, which isn’t consistent with how these functions typically relate to each other. Likewise, moving to no light perception before assessing light perception would prematurely skip a measurable level of function.