“Good lenses, bad frames” is used to describe someone who gives a bad first impression but is actually a good person, or someone who doesn't appear to be competent, yet is extremely capable at what he/she does.
“Good lenses, bad frames”(直譯為“好鏡片,賴鏡框”)通常用來描述那些給人第一印象不太好,但實際上人品很好的人;或者看起來沒什么本事,但其實工作能力很強的人。所以,可以譯為“人不可貌相”或者“真人不露相”。
For example:
Dr. Bruce is a spaz, but he's one of the best doctors I know. You wouldn't know it by looking at him...good lenses, bad frames.
布魯斯醫(yī)生是個怪人,不過他是我認識的醫(yī)生中最好的一位。看他的樣子你是看不出來的,他是真人不露相。