Perhaps you should try some spelling variations:
after photorefractive » of photorefractive (Expand search), with photorefractive (Expand search), in photorefractive (Expand search)
decrease processes » disease processes (Expand search), decay processes (Expand search), increase process (Expand search)
decrease decrease » decrease release (Expand search), disease decreases (Expand search), decreases disease (Expand search)
decrease after » increase after (Expand search), disease after (Expand search)
decrease on » decrease in (Expand search), decrease of (Expand search), decrease or (Expand search)
on decrease » on decreased (Expand search), or decrease (Expand search), of decrease (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease on decrease decrease processes ) OR ( decrease to decrease after photorefractive ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease on decrease decrease processes ) OR ( decrease to decrease after photorefractive ))*.