Sunglasses are nothing more than tinted glasses. The effect of sunglasses is that our eyes are overshadowed to the light, dimming, and sometimes even changing the colors of what we see around us. Christ has said "I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life." (John 8:12) Satan tries to deceive us. He overshadows our eyes, just like sunglasses, so that we can not see the true light, or the effects of the light. Until we take off the sunglasses, or disregard the temptations of Satan, we won't be able to see the beauty of the light of Christ.