While I realize that each case in unique, is it possible for a person who has suffered a stroke and lost 50% of their vision, to regain a portion of their vision? My father recently had a stroke and her is 65. Lastly, again, operating under the premise that every case is different, the doctor said his low hdl (around 20) was the cause. Is it possible for this to be the primary cause? I live out of state and information from them is a bit murky. Any and all feedback is appreciated.