I am sure the same can be said by many OMD's that have seen OD patients post "eyehealth assessments" who have had problems. You're also forgetting the role of the patient's primary health care provider, his/her family physician. Patient with all these listed medical ailments have no doubt already visited their own GP.
You're also forgetting recent advances in refraction technology, producing equipment that make for very accurate and consistent refractions. Just think...many years ago it was routine for a MD it taste a person's urine for sweetness in order to detect diabetes. Bloodwork and strips can do it now.
As for the word 'canard', obviously you are not overly 'erudite'. Perhaps you might request a dictionary for Xmas.:D
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