Beta-irradiation is generally accepted as a specific cure for recurrent pterygium.1 Of the five sources of β-irradiation now available for clinical use (x-rays produced by certain x-ray machines, radium, radon, radium D, and strontium 90), the 90Sr radioactive applicator was used in this study. The indication for its use was to combat the high incidence of pterygium recurrence after surgery, viz, 23 %.2 Whatever the indication for treatment with 90Sr β-irradiation may be, there is always the urgent question: what is a safe noncataractogenic dose?
The 90Sr applicator was introduced for ophthalmological use in 1950.3 In the ensuing 15 years many experimental studies have been published, reporting the complications of 90Sr β-irradiation. In contrast to this, relatively few clinical reports were written describing the late complications, such as cataractogenicity, of the human eye. The long observation time (several years being required to evaluate the
HILGERS JHC. Strontium 90 B-Irradiation, Cataractogenicity, and Pterygium RecurrenceResults of a Postirradiational Survey Five to Six Years After Treatment. Arch Ophthalmol. 1966;76(3):329-333. doi:10.1001/archopht.1966.03850010331005