the hue samples were designed to represent perceptually equal steps of hue and to form a natural hue circle .
they are numbered on the back according to the correct color order of the hue instruction manual and scoring sheets are provided .
the examiner prearranges the caps in random order on the upper lid of the box .
the observer is instructed to  arrange the caps in order according to color  in the lower tray [ with a see - through bottom ] , where the two fixed caps appear .
the box is presented for each eye at a comfortable distance under illuminate c providing at least 270 lux of natural light .
the generally recommended time for arranging each panel is 2 minutes . for each panel , the time spent on it is recorded , depending on the first panel , second panel , etc .
score of a cap is the sum of the differences between the number of that cap and the numbers of the caps adjacent to it on either side , e.g. , if cap number 50 is wrongly positioned say between 55 and 56 , then the score of this cap is 55 - 50 + 56  50 = 5 + 6 = 11 .
50 had been correctly positioned , then the score of that cap would have been 50  49 + 51  -50 = 2 : and with 2 subtracted , its error score would have been zero ] .
sum of the error scores of the entire set of caps goes to make the total error score ( tes ) . by plotting the scores
manual scoring of error scores and plotting graphs are of course extremely time consuming and very tedious . to overcome this ,
our attempt was to save needless time - wastage during precious hospital working hours , and increase maximum patient turnover in the limited time available to the professional specialist .
the test consists of 85 movable color samples arranged in four opaque boxes of 22 colors in the first box and 21 colors in each of the remaining 3 [ no . 85 - 21 , 22 - 42 , 43 - 63 , and 64 - 84 ] .
the hue samples were designed to represent perceptually equal steps of hue and to form a natural hue circle .
they are numbered on the back according to the correct color order of the hue instruction manual and scoring sheets are provided .
the examiner prearranges the caps in random order on the upper lid of the box .
the observer is instructed to  arrange the caps in order according to color  in the lower tray [ with a see - through bottom ] , where the two fixed caps appear .
the box is presented for each eye at a comfortable distance under illuminate c providing at least 270 lux of natural light .
the generally recommended time for arranging each panel is 2 minutes . for each panel , the time spent on it is recorded , depending on the first panel , second panel , etc .
score of a cap is the sum of the differences between the number of that cap and the numbers of the caps adjacent to it on either side , e.g. , if cap number 50 is wrongly positioned say between 55 and 56 , then the score of this cap is 55 - 50 + 56  50 = 5 + 6 = 11 .
50 had been correctly positioned , then the score of that cap would have been 50  49 + 51  -50 = 2 : and with 2 subtracted , its error score would have been zero ] .
sum of the error scores of the entire set of caps goes to make the total error score ( tes ) . by plotting the scores
manual scoring of error scores and plotting graphs are of course extremely time consuming and very tedious . to overcome this ,
our attempt was to save needless time - wastage during precious hospital working hours , and increase maximum patient turnover in the limited time available to the professional specialist .
the original fm 100-hue carrier box consists of a wooden cover with 4 elongated boxes inside it .
this is an opaque outer cover , so there is obvious difficulty in photo - documentation .
one had to manually record the scores of caps on sheets , which hugely prolonged the time spent per patient [ fig
the original fm 100-hue elongated boxes with an opaque wooden cover we modified the fm 100-hue procedure by converting the outer opaque box into a transparent clear plastic carrier container that allowed a ready photo - documentation of the  arranged open trays from the top and bottom without even opening the box or inverting the caps [ fig . 2 ] .
( the inner trays already have a flip - top opaque cover , but a see - through bottom ) [ figs . 3 and 4 ] .
we screened 200 reportedly normal and 50 known color defectives using this simply modified fm 100 -hue test , first od then os . after capturing the digital images from both the bottom and top of the 
arranged fm 100-hue box with patient i d , the [ used ] box was promptly handed over to the next subject for rearrangement .
our study followed the tenets of the declaration of helsinki and was duly approved by our institutional ethics committee .
our modified transparent carrier box for the fm-100 hue test the caps arranged by a reportedly normal subject , according to hue perceived [ photographed through the transparent plastic top cover ] - the arrangement is almost normal but slightly defective showing arranged numbers imaged from the bottom through the transparent plastic [ along with the patient i d ] - note the slight defects
the immediate test running time for each subject including the technician 's measuring and plotting time was reduced from 60 - 75 min to ~15 min with no waste of invaluable lab hours .
the box is relatively cheap and easy to maintain , and also replaces whenever required [ figs
. 3 and 4 ] . these numbers on the caps are normally not visible because of the original opaque cover  evidently , the investigator is standing by to observe that the patient does not turn over the entire box to peep at the numbers of the color buttons .
nowadays , the farnsworth munsell 100-hue test often includes windows based scoring software , which calculates a numerical score and provides a graphic display and printout of the subject 's score and status .
our simple modification and adjustment of the original box of the fm 100-hue test alone proved to be not just cost - effective but also permitted rapid assessment of color vision and quick patient turnover with easy data storage , without the need of any expensive scoring software with a requirement of a routine camera , preferably digital , for easy retrieval .
 purpose : the farnsworth - munsell ( fm ) 100-hue test is well known but is also time consuming , especially its analytical component . to reduce this needless time - waste during precious working hours , 
 a simple modification was devised.design:prospective , comparative , observational study.materials and methods : a transparent clear plastic carrier box replaced the opaque one , allowing ready digital photodocumentation of top and bottom without even opening the box , or handling / inverting the caps -200 reportedly normals and 50 known color vision defectives could be easily tested on this modified - fm and results stored , allowing rapid turnover . 
 the captured scores with patient i d were analyzed , at leisure , outside hospital time , saving 45 - 60 minutes / patient . 
 after recording , the box was promptly handed over to the next subject for rearrangement . 
 times taken for test / patient were recorded.results:running time was reduced from 60 - 75 min to ~15 min / patient with no waste of invaluable lab hours . turnover time is limited to capturing two photographs ( ~60 sec ) . 
 the box is relatively cheap and easy to maintain.conclusions:our simplified fm 100-hue test allowed rapid assessment of color visions with easy data storage of both top and bottom . 
None
Administration
Scoring
Materials and Methods
Results
Conclusion