I appreciate all this incredibly helpful info. I have many of these issues too. My opthamologist, a retinal specialist, told me my floaters are a result of dry eyes and the aging process. I use Systane Ultra. I keep one small bottle in my purse and one bedside.

Dry eyes

Tearing eyes

Blurred vision

Double vision

Light sensitivity

Touch sensitivity

Shift of focus issues

Eye pain

Eye pain on moving the eyes

Dizziness

Visual Distortion

Floaters

Flashing lights

Transition, near to far issues

Macular Degeneration

Frequent eye glass changes

Difficulty wearing contacts ( due to touch sensitivity )

Blindness ( in persons with rheumatoid arthritis,  a rare condition )

All of the above can occur with or without the most common medications given for FM, but … they tend to become worse in many cases, due to the medications we are commonly given, see details below.

Now, let us look at some possible causes for all of the above … they tend to come down to just a few, starting with one of the most common co-commitant disorders to tag along with FM, which is CMP.

Our eyes each have postural muscles involved in moving the eyeball and allowing us to focus, if these muscles are not functioning correctly due to spasms or trigger points, then eyesight can be distorted.”

“In order for vision to be clear, both eyes must take the same picture at the same time,” explains Devin Starlanyl in her book, The Fibromyalgia Advocate. “When this doesn’t happen, double vision, blurry vision, and/or changing vision can result. Misalignment of the eyes can be caused by trigger points interfering with the muscles that hold the eyeballs in place. Trigger points can be responsible for contracting these muscles at different tensions. Muscle fatigue would make things worse.” (Research ) ”

But this diagnosis however as I said, is often wrong, and it is rather easy to find it out, as there are specific blood tests for this disorder. More commonly seen however, is something called Sicca Syndrome ( which also has common blood work ) which is very common in CFS and FM. While the baseline effects with regard to the eyes are the same, the treatments are rather different, as well as the range of effects.

A study ( while admittedly small ) found decreased tear production in 90% of those with Fibromyalgia. Experience has shown that dry mouth is also common, aggravating dental and digestive problems. In those who suddenly get a bunch of dental cavities along with their CFS/FMS, dry mouth is the usual cause. This occurs because saliva is critical for preventing dental infections.

Sicca Syndrome is treatable, but not curable. It is caused by autoimmune disorders that injure the glands that make tears and saliva, but also is aggravated by nutritional deficiencies and by many medications that are commonly given for FM and others in general, such as :

Antihistamines — Including Benadryl, Zyrtec and Claritin…. antihistamines are often found in over the counter sleep aids.
Antidepressants — Elavil is a major trigger of dry eyes and mouth, but most antidepressants cause this problem. Cymbalta and Savella and others
Birth Control Pills — May cause dry eyes as a side effect. 
Diuretics — These drugs are mostly used to treat high blood pressure.
ACE Inhibitors — Angiotensin-converting enzyme inhibitors are mostly used to treat high blood pressure.
Acne Drugs — Including Accutane and high dose vitamin A.
All Opiates ( Research )and the most common pain relievers, such as ibuprofen (Advil, Motrin, others) and naproxen (Aleve)

“The underlying cause of Sicca syndrome is the improper function of the immune system. With this disorder, immune cells attack the cells of the exocrine glands. Slowly, the glands begin to fail in their function of providing proper levels of hydration throughout the body.”

There is no cure for Sicca syndrome. For this reason, treatment focuses on making up for the failure of the exocrine glands and keeping the organs of the body properly hydrated. Artificial tears are administered daily in order to help with dry eyes, while prescription medications like pilocarpine or cevimeline are administered to help increase the flow of saliva to a normal range. Various other medications can help protect internal organs from complications arising from the syndrome” See Link for more on this disorder, which has some very broad and far reaching effects.

Other issues:

“Visual problems and visual symptoms are common with FM. The different FM “problems” can also explain specific visual problems:

FM myofascial pain ( Which is the CMP above ) = eye muscle pain. Eye pain is frequently the result of painful eye muscles. Yes those muscles get myofascial pain pain too and can cause headaches, pain when looking in different directions, pain when blinking hard or opening the eyes wide, “stiffness” with moving the eyes. This may also cause our eyelids to twitch, and contributes to blurred vision and problems focusing.

FM allergies/sensitivities = eye allergies/sensitivities. Our eyes water, itch, and burn more, are bothered more by smoke, strong odors, and sunlight. This contributes to blurred vision and eye pain.

FM autoimmune dysfunction = eye autoimmune dysfunction. Dry eyes are common and they contributes to eye pain and blurred vision.

FM dysautonomia = eye dysautonomia. This likely plays a role in sensitivities, poor night vision, difficulty focusing, blurred vision and other eye symptoms.

FM brain fog = eye “fog.” This leads to the visual overload we often experience especially when shopping and scanning shelves and having problems visually deciphering exactly what we are seeing. This also explains when we read and re-read the same paragraph and still don’t “understand” what we just read. This is our visual-brain disconnection that’s part of the fibro-fog. ( Notations )

Dry eyes:

Is a very common issue in FM/CFS that is often mistakenly taken to be Sjögren’s syndrome, a common overlapping disorder with FM, but it can be found for some, to be a root cause for dye eye as: ” the body’s immune system attacks the moisture producing glands, like the tear glands and salivary glands, leading to symptoms of dry eyes, that can feel itchy, gritty or burning. Also a dry mouth, which can affect talking, chewing and swallowing.” it is rather easy to see why the eyes would be effected in this way.

I usually have those symptoms and visual issues before a migraine. it is called migraine with aura. Sometimes my visual issues will be within a half hour of the migraine or sometimes an entire day before a migraine. There are even times I have these symptoms but no actual migraine that follows. You are not alone.