Journal List > J Korean Ophthalmol Soc > v.49(3) > 1008217

Ahn, Kim, and Lee: Factors Affecting Stereopsis After Pediatric Cataract Surgery

Abstract

Purpose

To evaluate factors influencing stereoacuity outcomes after pediatric cataract surgery.

Methods

We retrospectively reviewed 38 eyes of 22 patients who had undergone irrigation and aspiration of cataracts and primary posterior chamber intraocular lens implantation from February 1992 to July 2006. In all patients, stereoacuity was assessed with the Titmus stereo test. Patients were divided into two groups according to stereoacuity: group 1 (n=9) had a stereoacuity less than 100 sec/arc; group 2 (n=13) had a stereoacuity more than 100 sec/arc. Nine variables associated with stereoacuity were evaluated in each group.

Results

Postoperative strabismus was the strongest factor influencing the stereoacuity level. Good postoperative mean visual acuity was related with good stereoacuity. Though mean visual acuity in two children with exodeviation over 30PD was 0.7 and 0.8, their stereoacuity was 400 sec/arc. Showing little difference in the spherical equivalent between the eyes was also related to good stereoacuity.

Conclusions

Postoperative strabismus onset, postoperative mean visual acuity between the two eyes, and differences in the spherical equivalent were important factors influencing stereoacuity in patients after pediatric cataract surgery.

References

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Figure 1.
Distribution of stereoacuity of all patients.
jkos-49-493f1.tif
Figure 2.
Relationship between postoperative mean visual acuity between fellow eyes and stereopsis. Mean visual acuity in two children with exodeviation over 30PD was 0.7 and 0.8, respectively. But stereoacuity was lower than that of children without strabismus with the same level of mean visual acuity (red triangle).
jkos-49-493f2.tif
Table 1.
Associations of laterality of cataract with stereoacuity
  Group I (≤100 sec/arc) n=9 (40.9%) Group II (>100 sec/arc) n=13 (59.1%)  
Bilateral cataract 2 (33.3%) 4 (66.7%) P=0.196*
Unilateral cataract 7 (43.8%) 9 (56.3%)  

* Chi-square test.

Table 2.
Associations of surgical methods with stereoacuity
  Group I (≤100 sec/arc) n=9 (40.9%) Group II (>100 sec/arc) n=13 (59.1%)  
Intact posterior capsule 0 (0%)     4 (100%)  P=0.110*
Optic capture through PCCC 5 (41.7%) 7 (58.3%)  
Anterior vitrectomy 4 (66.7%) 2 (33.3%)  

* Chi-square test

PCCC=Posterior curvilinear continuous capsulorhexis.

Table 3.
Associations of after cataract with stereoacuity
  Group I (≤100 sec/arc) n=9 (40.9%) Group II (>100 sec/arc) n=13 (59.1%)  
Presence of after cataract 2 (28.6%) 5 (71.4%) P=0.421*
Absence of after cataract 7 (46.7%) 8 (53.3%)  

* Chi-square test.

Table 4.
Associations of postoperative onset of strabismus with stereoacuity
  Group I (≤100 sec/arc) n=9 (40.9%) Group II (>100 sec/arc) n=13 (59.1%)  
Presence of strabismus (>10PD) 0 (0%)      5 (100%)  P=0.049*
Absence of strabismus (≤10PD) 9 (52.9%) 8 (47.1%)  

* Chi-square test

PD=prism diopters.

Table 5.
Associations of sensory fusion with stereoacuity
  Group I (≤100 sec/arc) n=9 (40.9%) Group II (>100 sec/arc) n=13 (59.1%)  
Presence of fusion 9 (56.2%) 7 (43.8%) P=0.017*
Absence of fusion 0 (0%)      6 (100%)   

* Chi-square test.

Table 6.
Simple associations of visual acuity difference, mean visual acuity, spherical equivalent difference between fellow eyes, and age at surgery with stereoacuity
  Correlation Coefficient P-Value*
Visual acuity difference 0.116 0.608
Mean visual acuity 0.233 0.297
Spherical equivalent difference 0.423 0.042
Age at surgery −0.02 0.929

* Chi-square test.

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