Temporary blurry vision 5 to 15 mins.

Yesterday I faced the same issue of blurred vision for 5 minutes after a year. Last it was so frequently. One month I faced it 4-5 times. First time it was happen 4 years before. It is occurred 10 to 20 times. Test : complete MRI, ECG, eye check up multiple times and other blood test went through but cause not identified by doctor. I am marathon runner and moderate in physical exercise. 23.4 is my BMI and age is 35. Again yesterday I gave the blood sample for full body advance check up and some difference this time: For liver :Sgot is 45.6 and sgpt is 76.8 Into HAEMOGRAM : MCH - 28.9 MCHC - 31.7 RDWCv - 11.2 Eosinophils - 8.0 I visited many doctor but did not find cause. I think this to all to tell me what is the issue ? I don't want to take any blind medications. Please understand and guide me. Thanks Kuldeep