In nine members from three generations and in a distant relative, at l
east three significant characteristics of the ectopia lentis et pupill
ae syndrome were established including ectopia lentis, ectopia pupilla
e, persistent pupillary membrane, iris transillumination, and poor pup
illary dilatation. All patients developed bilateral cataract before th
e age of 40 years, and two patients presented with intermittent acute
intraocular hypertensive crises. Not only the high number of patients
in one family, but also the occurrence in three generations is very ex
ceptional for the ectopia lentis et pupillae syndrome. Although the sy
ndrome is said to be inherited in an autosomal recessive mode, in this
family, a mother to son and a mother to daughter transmission were pr
esent. Pedigree analysis yielded arguments in favour of an autosomal d
ominant inheritance with reduced penetrance. A biochemical correlation
was not identified.