a young boy , 16 years old , presented with complaints of poor 
 vision in the left eye since childhood .
, he had a vision of 20/200 in the 
 right eye ( re ) and 20/20 in the left eye ( le ) .
zonules 
 were lacking around the fissure between the two lobes [ fig . 1 ] . 

2 ] revealed 
 a bilobed lens in the anterior segment of the eye with normal 
 posterior segment .
partial congenital 
 aphakia is a rare condition in which the lens appears to be 
 partially divided by a deep furrow.1 in the case of congenital duplication of lens reported by 
 thakkar et al.2 two lenses were placed obliquely in a straight line 
 with a clear area in between .
richardson3 reported 
 a case in which the two lenses were asymmetrical , one being 
 larger than the other .
the mechanism for this anomaly is not known yet . whether 
 it is part of a phylentogenic spectra or represents development 
 from two embryonically separate lens remains a question .
duke 
 elder has tried to explain the occurrence of the two entities 
 based on separate embryonic developmental sequences.1 he 
 suggested that the metaplastic changes in the surface ectoderm 
 leads the lens plate to invaginate at two place and forms two 
 lens vesicles which results in double lens.1 this suggests that 
 the lens is divided before the lens starts developing .
our case has a deep furrow in the center fig . 1 with 
 localized absence of zonules .
we , therefore , suggest that once 
 the deep furrow is formed due to absence of zonules , it may 
 go further ( deep ) enough to divide the lens into two distinct 
 parts .
therefore , the absence of zonules is significant and these 
 furrows may be deep enough and progress to duplication .
it 
 is a possibility that the lens duplication might be occurring 
 when the lens vesicle is single and it is the laxity and abnormal 
 stretching which causes the deep furrow and possibly 
 duplication .
it is interesting to note that both the 
 cases previously reported2 - 3 had lens place in a straight axis at 
 opposite ends .
this gives further credence to our theory of the 
 fissure dividing the lens into two and the remaining zonules 
 pulling them away from each other .
since lens coloboma occurs frequently such deep furrows 
 ( bilobed lens ) are uncommon .
we believe that it represents the 
 missing link between the colobomatous lens and duplicated 
 lens .
we understand that a single case report may not be 
 suggestive of any mechanism but nevertheless it does indicate 
 a possible mechanism of lens duplication .
 congenital anomalies of the lens include a wide range from lens 
 coloboma to primary aphakia and doubling of lens . 
 there have 
 been few case reports of double lens ; the etiology suggested 
 is metaplastic changes in the surface ectoderm that leads to 
 formation of two lens vesicles and hence resulting in double lens . 
 
 we report a case with bilobed lens , which raises the possibility of 
 explaining the etiology of double lens . 