眼内レンズが挿入された緑内障眼の静的量的視野の評価

Static visual field in eyes with glaucoma and intraocular lens

　緑内障の眼内レンズ挿入眼で眼内レンズが偏位した症例に視野異常がみられ，レンズの偏位による影響と思われる2例を紹介した。偽水晶体眼の緑内障の経過観察において，眼内レンズの偏位があると，静的視野に影響することを考慮し，ゴールドマン視野計との併用が必要であり，静的視野の評価には有水晶体眼と異なる見方が必要である。

A 70-year-old female underwent laser iridotomy for acute closed angle glaucoma 5 years before. Her right eye was later treated by basal iridectomy, extracapsular lens extraction and implantation of posterior chamber lens. Automated perimetry showed visual field defects typical for incipient glaucoma. Conventional dynamic perimetry with Goldmann perimeter gave equivocal results.

A 61-year-old female underwent surgery with extracapsular cataract extraction, implantation ofintraocular lens (IOL) and trabeculotomy for both eyes. Primary open angle glaucoma had been pres-ent at least for 3 years. The IOL was well centered in her right eye and was decentered superiorly in the left. Automated static perimetry showed the visual field to have remained unchanged before and 3 months after surgery in the right eye, Definite changes in visual field were noted in the left eye.

It was not possible to determine whether the observed visual field changes in the two pseudopha-kic eyes were real or artifacts due to decenterd IOL.