PT on the Net Research

Blurred Vision with Cardio


I am a personal trainer and was wondering whether you could help work out why I have started developing slight blurred vision when I do CV exercise? I do quite a lot of exercise, but it does not feel that my blood sugars are too low as it occurred even straight after carbs. I am not diabetic. I have 120/80 blood pressure. I recently suffered with slight whiplash during a snowboard fall, but this has been sorted (I think!). However, I do get tight rhombs, upper/mid traps and pec minor through the amount of massage and this fall. Could this be the reason? I cannot remember whether I had this slight blurred vision before or after the fall. Please help!


I wish I had a black and white answer for you. Unfortunately, as I cannot actually perform a complete Subjective and Objective examination with you, I can only provide some areas of speculation that arise from the limited information available. Firstly, it is imperative that you see your doctor as several areas of importance need to be excluded, these being of a neurological and/or vascular nature including:

  1. Damage to anatomical structures that may (or may not) have been caused during your fall including trauma to the occipital lobe of the brain, Cranial Nerve injury (CN 2, 3, 4, 6) or damage to the retinal structures themselves.
  2. The link between exercise and the blurring of vision is also suggestive of a cardio vascular nature (e.g., inadequate blood supply under increased demand).

These can apply in combination (i.e., damage to an anatomical structure in your neck can be compressing on nerves or occluding blood vessels).

Apart from these areas, without a greater knowledge of your circumstances, it becomes increasingly difficult to target any advice. For example, are you on any medication (e.g., some muscle relaxants can cause blurred vision)? Have you seen a physio/physical therapist for your whiplash? If so, were there any Ocular Reflex deficits noted? Do you have any signs of tension-type headaches? Do the vision changes have a set activity/diurnal pattern? Does your vision ever return to normal? If so, when and why? Are both eyes involved? Are specific visual fields affected?

So with this in mind, the initial step is to see your general practioner to clear the two major concerns (neurological/vascular). Then if required, see an ophthalmologist to check the eyes for any pathology. Finally, I would see a physio/physical therapist who can identify and treat/provide management for neuromuscular and vestibular causes.

While this is not the "easy fix" solution that I wish it could be, I have hopefully provided you with some management options. Good luck!