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要約 目的:回折型多焦点眼内レンズ(IOL)摘出交換後に,コントラスト感度が改善した緑内障眼の1例を経験したので報告する。
症例:48歳,女性。両眼に原発開放隅角緑内障を認め,現在点眼治療中である。右眼の水晶体再建術,線維柱帯切開術を前医にて施行,回折型多焦点IOLを挿入しており初回手術後にYAGレーザーを施行していた。初回手術後の視力不良に対してセカンドオピニオン目的にて北里大学病院を受診した。前医での白内障手術前の視力は右0.04(0.7×−6.50D()cyl−0.50D 80°)で,当院初診時の視力は右遠方(0.15p×IOL)(0.6×−1.00D()cyl−2.00D 170°=IOL)であった。眼圧はゴールドマン眼圧計で右18mmHg。当院でのハンフリー視野計SITA Standard 24-2のmean deviation値は右眼−15.75dB,中心窩閾値は26dBであった。コントラスト感度は明らかに右眼が低下していた。右眼はスリーピースの回折型多焦点IOLが囊外固定されており,大きな後囊切開を認めた。IOLの摘出交換の方針となり右眼を単焦点IOLに交換した。IOL摘出交換後の矯正視力は0.7で,コントラスト感度も改善し,自覚的にも違和感は改善した。
結論:回折型多焦点IOL摘出交換後にコントラスト感度の改善を認めた緑内障眼の症例を経験した。中心視野障害を有する眼に対する多焦点IOLの使用は視機能を著しく低下させる可能性がある。
Abstract Purpose:We report a case of glaucoma in a patient with improved contrast sensitivity after multifocal intraocular lens exchange.
Observation:A 48-year-old woman with primary open-angle glaucoma(POAG)in both eyes and currently undergoing with eyedrops presented to the department treatment. She had undergone cataract surgery and trabeculotomy(LOT)in the right eye previously, which was performed by another doctor. A multifocal intraocular lens(IOL)was inserted, and YAG laser treatment was performed postoperatively. She visited our hospital for a second opinion owing to poor visual acuity after surgery. The pre-operative visual acuity of the right eye, as recorded by the previous doctor, was Vd=0.04(0.7×−6.50D=cyl−0.50D 80°), and the visual acuity at the first visit to our hospital was Vd=(0.15p×IOL)(0.6×−1.00D=cyl−2.00D 170°=IOL). The intraocular pressure in the right eye was measured with a Goldman tonometer and was found to be 18 mmHg. The mean deviation(MD)and foveal threshold on HFA24-2 for the right eye were −15.75 dB and 26 dB, respectively, and the contrast sensitivity was reduced. A three-piece multifocal IOL was used in extracapsular fixation, and a large posterior capsule incision was noted. It is standard practice to perform multifocal IOL exchange, and a monofocal IOL was replaced in the right eye. The corrected visual acuity after operation was 0.7, the contrast sensitivity had improved, and the discomfort had also improved relatively.
Conclusion:We report the case of a glaucoma patient with improved contrast sensitivity after multifocal IOL exchange. The use of multifocal IOLs in eyes with central visual field defects can significantly reduce visual function.
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