Interesting question, and if I understood you correctly in contradiction with these old reports:

Indian J Ophthalmol. 1992 Apr-Jun;40(2):44-7.

"A retrospective cohort study for prognostic significance of visual acuity for near over that for distance in anisometropic amblyopia.".

Singh V, Sinha S, Singh GK.

Source

Department of Ophthalmology, K G's Medical College, Lucknow.

Abstract

A cohort of 50 anisometropic amblyopes, between the ages of 2.5 to 10 years, was studied retrospectively to assess the prognostic significance of visual acuity for near over that for distance. There is ample evidence in the literature for a significantly lower accommodative response in the anisometropic amblyopic eye. It has been proposed that the efferent accommodative dysfunction may be a fundamental and causative factor in anisometropic amblyopia. A reduced visual acuity for near over that for distance was found in 17 [34%] patients and in 11 out of these the near vision improved after an addition of +3.0D sph. When a reduced visual acuity for near, was obtained it was difficult to determine whether the visual afferent system (due to insufficient visual input), or the accommodation efferent mechanism was responsible. However an improvement in corrected near vision by addition of +3.0D sph. suggested an accommodative dysfunction. In patients with reduced visual acuity for near over that for distance, not only was the final visual outcome poor but also the onset of visual improvement in response to amblyopia therapy was delayed.

Trans Ophthalmol Soc U K. 1980;100(4):501-3.

Reading capacity in cases of 'cured' strabismic amblyopia.

Zürcher B, Lang J.

Abstract

Fifty cases of cured amblyopia were examined in relation to distance vision, near vision, and reading capacity. Occlusion had been abandoned at age 8; the examination was made at age 12. Although linear vision for distance and near was full, reading capacity was markedly impaired. In order to prevent this 'reading amblyopia', sneaking-out or tapering-off occlusion with alternating calibrated filters is continued until the child can read fluently with each eye.

Dear Dr Samuel,

Thank you for your answering, these reports also show it is possible to exist different channels for different distances of view points.

I would like to say that perhaps there are different channel of vision for different distances of vision. In this regard, sometime we can see other evidences in vision clinic. for instance, in divergence excess exotropia, the patients have binocular single vision with good stereo acuity in near vision while in distance vision may show a large angle XT with suppression. It seems to exist different systems or channels for visual performance in these two different distances.

Ali,

interesting topic! I don't see any evidence for separate (neural) channels for near vs. far vision, however. All I can see so far is evidence for the role of accommodation.

Best wishes, Hans