Fig 1.
A. Patient seated one meter from an eye level tangent screen with the technician holding the target wand against the pattern of isopters and radians. B. Test pattern for the superior visual field shown above the central fixation point.
Fig 2.
Tangent fields measured in the vertical meridian and area under the curve.
Patients had tangent fields analyzed in the vertical meridian (A. Vertical SVF) and area under the curve (B. SVF Area) for their preoperative and postoperative visits. Both preoperative taped and postoperative measures were significantly greater than preoperative in the natural position (p<0.0001). Preoperative field loss calculated as taped position-natural position averaged 15.6° and 697°2. Surgery induced a mean field increase of 13.6° and 609°2.
Fig 3.
Correlation of Vertical to Area measures.
Preoperative measurements were recorded with the eyelids in the natural position. Degrees of superior field in the Vertical meridian were very well correlated with degrees2 of Area under the curve on tangent screen (r = 0.87).
Table 1.
Measures of clinical exam and visual fields, by surgical subgroups.
Fig 4.
Surgically induced changes in MRD1.
Patients were divided into surgical group and the change in MRD1 measurement from preoperative to postoperative visit was determined. Increases were found in all groups: blepharoplasty = 0.8 mm, ptosis repair = 3.1 mm, blepharoplasty and ptosis repair = 2.8 mm (p<0.0001 for all groups).
Fig 5.
Correlation between MRD1 and superior fields.
Patients were divided into surgical group and MRD1 was correlated with Vertical (A) and Area (B) measures. Patients undergoing ptosis repair or combined surgery had an excellent correlation between MRD1 and both measures of superior field. There was limited correlation in the patients who underwent blepharoplasty alone.