private IshiharaResultFlag EvaluatePlateAnswers(IshiharaPlateReadLimits limits) { var count = AnswerList.Count(CompareNormalPlateReadCountToLimits(limits)); if (count >= limits.LowerLimitOfPass) { return(IshiharaResultFlag.NormalVision); } return(count <= limits.UpperLimitOfFail ? IshiharaResultFlag.ColorVisionDeficit : IshiharaResultFlag.IndeterminantResult); }