William Shakespeare’s “Sonnet 130” or “My mistress' eyes are nothing like the sun” is what is sometimes called an “anti-Petrarchan sonnet.”
It is in the form of a traditional English or Shakespearean sonnet, consisting of fourteen lines of iambic pentameter rhymed abab cdcd efef gg.
Thematically, the first three quatrains compare his mistress unfavourably to the idealized woman of the Italian sonnet tradition. The comparison is intended to not to insult his mistress, but instead to highlight the complete unreality of the idealized woman of the sonnet convention.
In the final couplet, the narrator asserts that he loves his mistress even though she has normal human imperfections and that the comparison with an unreal ideal is unreasonable.