Eye strain and convergence insufficiency

Eye strain and headache are common ocular symptoms,
and the main cause in persons aged 15 to 40 is convergence
insufficiency. It is more common in females than in males.
Many patients are supplied with glasses for eye strain
without the causative convergence insufficiency being
treated. The treatment in most cases is orthoptic exercises.

Comment: This article was written more than 30 years ago in the British Medical Journal.....why won't all of our OMD colleagues accept this? Even then it was known that orthoptics (aka optometric vision therapy) was the treatment of choice. DM