The Choyce Mark VIII anterior chamber implant: primary and secondary implantation compared.

The author only started primary Mark VIII implantation in 1970, and has only a modest total of 50 cases at this time. Therefore it is premature to draw too many conclusions when comparing this small series with secondary implantation going back over 20 years and covering approximately 1200 years. However the following tentative conclusions are drawn: 1. When confronted with pre-existing aphakia (particularly unilateral) the visual and psychological results of secondary Mark VIII implantation are excellent over a wide spectrum of indications and ocular states. It is a very adaptable and versatile implant--a true "Implant for all Seasons" as Clayman has said. 2. Primary Mark VIII implantation shows considerable promise, particularly when allied to a well-thought-out and carefully-executed microsurgical technique as devised by Tennant. The author is performing more and more primary implantations and regards second eyes as a very favorable indication.