Myopia (short-sightedness) is the inability to focus the eye on distant objects. Peter uses it as an illustration of those Christians who have received so much from God (grace, peace, faith, promises and power - 2 Peter 1:1-4), and yet are unwilling to put everything into their relationship with Jesus. That is why Peter has prescribed a spiritual work-out of: practising goodness, getting to know God, self-control, perseverance, godliness, kindness and love (2 Peter 1:5-7).