Well, in our case there was no reason to because of the nature of the drugs that we found, they don't get to the vitreous. It just takes too long and they are not present.
The vitreous is very slow for equilibration. That is the concentration goes up in the blood and then it declines and the vitreous lags on some drugs. On these drugs the vitreous stays very low, the drugs do not penetrate into the vitreous.