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Spatial localization after different types of retinal detachment surgery
1Tennent Institute of Ophthalmology and the. Department of Orthoptics, Gartnavel General Hospital, Glasgow, Scotland, United Kingdom. cliff@weir88.freeserve.co.uk
Purpose:
To compare the effect on spatial localization of two different forms of surgery for primary rhegmatogenous retinal detachment.
Methods:
Two groups of 30 patients (one group undergoing conventional external scleral-buckling procedures, the other undergoing vitrectomy procedures) were recruited. They pointed at targets appearing on a computer touchscreen without being able to see their hands, while viewing targets with the non-surgically treated eye. The sizes of the horizontal pointing errors were recorded on three separate occasions: before surgery, on the first postoperative day, and approximately 10 days later.
Results:
On the first postoperative day a significant change in localization of 2.9 +/- 0.9 degrees [SD]) was observed in the scleral-buckling group, compared with 1.3 +/- 0.6 degrees in the vitrectomy group. These changes resolved by the second postoperative assessment.
Conclusions:
These results, particularly in patients in the scleral-buckling group in whom greater manipulation of the extraocular muscles inevitably occurs, are consistent with an alteration in the extraretinal eye position information that is used in spatial localization. This is likely to be a consequence of modified efference copy and/or extraocular muscle proprioception.