5度角度付き変形Jループ後房レンズ

A posterior chamber intraocular lens with modified J-loop tilted by 5 degrees

　5度角度付き変形Jループ後房レンズ（HOYA J-5 IOL_R）を試作・試用した．本レンズは移植が容易で，嚢内移植も困難でない．初心者の多い今回の成績でも50％以上，多少習練を積めば100％近く嚢内移植ができると思われる．またHOYA J-5 IOL_Rでは原発性瞳孔捕獲はおこらず，続発性瞳孔捕獲のみ4％に見られた．

　本レンズはどのように移植されても不自然な後嚢の緊張は見られず，したがって虹彩根部圧迫も生じないと思われた．HOYA J-5 IOL_Rのプロリンループは柔かく形状適応がすみやかなので，嚢内移植の際，術直後に見られるループに平行の後嚢皺襞も大部分の症例で1週間以内に消失した．

The posterior chamber lens (PCL) with plane modified J-loop occasionally develops iris capture as postsurgical complication. Its 10° angulated variety, developed for avoiding the capture, has its specific complication known as iris transillumination defect and microhyphema syndrome.

To avoid these complications, I designed a new modified J-loop PCL with 5° angulated lens haptic (HOYA J-5 PCL). It was implanted in consecutive series of 71 eyes in 70 patients treated in my institution.

All the treated eyes attained a postoperative visual acuity of 0.6 or more. Visual acuity of 1.0 was obtained in 54 out of the 71 eyes (76%). No serious complication was encountered during or following surgery except one case of posterior capsule rupture. In 38 eyes (54%), both loops were implanted and stayed in the bag. In 15 eyes (21%), one loop remained in the bag and the other out of bag. In 5 eyes (7%), both loops stayed out of the bag. The site of the loop could not be located in the other 13 eye.

There was no primary iris capture due to the anterior positioning of the lens optic. In 3 eyes (4%), secondary iris capture developed due to adhesion of the iris to the lens capsule or to the edge of the PCL.

Rinsho Ganka (Jpn J Clin Ophthalmol) 41(1) : 33-37, 1987 C41