A 10-year old male castrated cat that you have previously diagnosed with hyperthyroidism presents to you for acute onset of blindness. You perform an ophthalmic exam and note retinal hemorrhage. What diagnostic test should you perform first?
你以前诊断出患有甲亢的10岁雄性已绝育猫由于突发性失明前来就诊。你为其进行了眼科检查，发现视网膜出血。你首先需要做怎样的诊断检查？
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