What type of syndrome is described by counting the D's?

The mention of counting the D's specifically relates to Duane's syndrome, which is characterized by congenital eye movement abnormalities. In this context, the "D’s" often refer to the three types of Duane syndrome: "D" for type one (limited adduction, or eye movement towards the nose), "D" for type two (limited abduction, or movement away from the nose), and "D" for type three (limited movements in both directions). This mnemonic method is useful in memorizing the characteristics and types of Duane's syndrome, emphasizing its distinctive features related to ocular motility.

Other conditions listed, such as craniosynostosis, lupus, and Turner's syndrome, do not have a classification system that utilizes counting D's. Craniosynostosis refers to the early fusion of skull bones, lupus is an autoimmune disease, and Turner's syndrome is a chromosomal condition affecting females. None of these are characterized or memorized using a similar mnemonic framework as Duane's syndrome.