ADHD. What came first – the chicken or the egg?

I am not an authority on specific learning difficulties in children, but I saw this young man recently and began to wonder how his prescription related to the diagnosis of ADHD:

Background:

Age 6, and not performing well at school (Year 1).  He appears to have a very short attention span and is exceedingly boisterous. His parents inform me that he is under investigation for ADHD.  He is large for his age and I noted a PD of 63/60.  Birth history normal – no other general health issues in himself or his family. 

He came to see me for his first eye examination. There was no specific reason for booking the examination other than accompanying his older 10 year old myopic sister.

Unaided Vision: despite the poor attention span I recorded,

 R 6/36    (matching test at 6m)       Near unrecorded – would not concentrate for long enough
 L 6/24    (matching test @ 6m)

Large exophoria for near, with good recovery.
Stereopsis  600� (Lang)

Cycloplegic examination gave the following ret results:

+ 7.00 / -2,50 x 160 = 6/18 part
+ 5.00 / -2.50 x 180 = 6/18

My question is, could the learning difficulties be a cause or a consequence of this uncorrected refractive error?
I am open to suggestions.

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