Fact or Determining a Fact in Issue A trial court has wide discretion in determining which matters are proper subjects of expert opinion testimony. Bryant v. Buerman, 739 So. 2d 710, 712 (Fla. 4'h DCA 1999). However, that discretion is not without limits. Nathanson v. Houss, 717 So. 2d 114 (Fla. 4th DCA 1998). R