Reading ability before and after macular translocation
Gentner C., Janknecht P.
Universitäts-Augenklinik, Freiburg
Introduction: A patient mainly judges the postoperative benefit
of a macular translocation by the ability to read. We therefore determined
the need of magnification to read with suitable low-vision aids pre- and
postoperatively.
Patients and methods: 10 patients with age-related macular degeneration
were treated with macular translocation. No counterrotating muscle operation
was carried out. We proved the necessary magnification to read a newspaper
and determined a suitable low-vision aid. Patients described their subjective
impairment and metamorphopsia based on analog scales.
Results: Anatomically: 6/10 eyes had to be operated twice because of proliferative
vitreoretinopathy (PVR). In one case an occlusion of a retinal vessel
occured. 1 eye had to be filled with silicone oil permanently because
of persisting retinal detachment in the periphery. In three eyes the retina
remained well attached even after removing the silicone oil. Functionally:
In 2 patients visual acuity improved and the amount of magnification decreased.
Reading was possible with low-vision aids. 1 patient had a visual acuity
of 0.1 pre- and postoperatively, but no reading ability in contrast to
preoperative findings. In 7 patients (including all patients with PVR)
visual acuity decreased, no reading ability was achieved. In 5 patients
a counterrotating muscle operation had to be performed because of vertical
and torsional diplopia. In 4 of those patients trouble disappeared postoperatively.
The final results with regard to subjective impairment and the metamorphopsia
remains to be seen.
Conclusion: The main problem of macular translocation is the high
rate of PVR, increasing the risk of loss of visual acuity significantly.
Interestingly the patients whose visual acuity decreased postoperatively,
had occult neovascularisation membranes only, but were exactly those patients
suffering from retinal detachment also. If visual acuity improved the
amount of magnification to read the newspaper decreased and it was possible
to fit a low-vision aid successfully. Disturbing diplopia can be treated
well by muscle surgery.
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