Self-Assessment Surveys | London Vision Training Clinic

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Concussion / Brain Injury

BIVSS

Brain Injury Vision Symptom Survey

Use this survey if you have experienced a concussion, traumatic brain injury (TBI), stroke, or acquired brain injury. It screens for a broad range of vision symptoms across 7 categories including eyesight clarity, light sensitivity, depth perception, and reading.

Questions 28 items

Threshold Score ≥ 31

Est. Time ~5 min

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Near Vision / Reading

CITT

Convergence Insufficiency Symptom Survey

Use this survey if you experience eye strain, headaches, blurry or double vision, or difficulty concentrating when reading or doing close-up work. It is designed to identify convergence insufficiency (CI) — a common near-vision disorder.

Questions 15 items

Threshold Score ≥ 21

Est. Time ~3 min

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Not sure which to choose? Quick comparison

	BIVSS	CITT
Best for	Concussion, TBI, stroke, ABI	Reading strain, near-work difficulty
Symptoms covered	Broad visual, spatial, reading, light sensitivity, dry eyes, depth perception	Eye strain, headaches, blurring, double vision, concentration, reading difficulty
Number of questions	28	15
Clinical threshold	≥ 31 out of 112	≥ 21 out of 60
Can I take both?	Yes — some patients benefit from completing both surveys.