The 1920’s was a peak period of Dr. Mathra Das’s campaign against cataract. He would hold camps and perform hundreds of surgeries daily. He invented his own technique of removing the Cataract in 1921, which he didn’t seek to get published in any Medical Journal. His fame grew and it was common for doctors both of Indian and foreign origin; to come to Moga to train under him. He had made a rule for these doctors, that after training for sometime, the Indian doctors were allowed to do one eye operation daily and foreign doctors were allowed three eye operations daily. It was also a practice that these doctors would take a group photograph with Dr. Mathra Das before going back to their countries after completing their training.

In 1925, Col. Smith returned to Moga with his son for training and they stayed as personal guests of Dr. Mathra Das. Out of respect for Col. Smith and their past relationship, Dr Mathra Das allowed his son to perform five eye operations daily when he completed his training. However, Col. Smith suggested that out of the daily total number of eye operations half of the lot should be given to his son and other half may be divided among other doctors. When Dr, Mathra Das didn’t agree to this the Smiths went back to England. Upon their return they got published in the Medical Journal of England and of America the new technique of operation for removal of cataract, claiming that Col. Smith had invented this technique.

But the medical community was a close knit community even back then; and when the American Dr Bull who had been to Moga for training in 1922, saw this Journal, he immediately wrote to the Editor of the Medical Journal that he had already seen this technique of cataract operation in 1922 at Moga and this was the technique of Dr Mathra Das of Moga (India). He also informed Dr. Mathra Das about this and group photographs of the doctors who came for training in 1925 served as proof of timeline since they had both Col. Smith and his son with Dr. Mathra Das. And Dr Bull had visited in 1922, years before that and learnt the same technique from Dr Mathra Das then. In this way the Smiths claim was proved unworthy and Dr. Mathra Das was recognised the world over as the creator of this path breaking new eye surgery technique for the removal of cataract and was published in Medical Journals in England and America, something that he hadn’t originally aspired towards.  

On 1st of January 1903 he took charge of Civil Dispensary, Moga but since it was situated on the main road from Ferozpur to Ludhiana and was at a distance from Moga village and there was a jungle in between; very few patients would come. Looking to improve the numbers, he sought permission from the Deputy Commissioner of Ferozpur to keep one table, almirah and some medicines at Moga village itself where he would like to see the village patients daily in the evening in addition to his morning duty at the dispensary. Once permission was granted he started going to Moga village on his bicycle in the evenings to see the patients there. This method worked and the number of patients started increasing. In 1903, he did three cataract operations and in 1904 the number rose to 43. He was giving free food and also paying conveyance charges to poor patients to go back to their villages.