LAST autumn when I was asked to address the Ophthalmological Section of the Royal Society of Medicine I was rather doubtful whether I should be able to present any really new research work. We have to do our research alongside strenuous routine work and I do not think that we shall be able to assert ourselves in this field until we have whole-time researchers attached to the clinic. I have therefore decided to talk about a few clinical problems, to which we have directed special attention during the last few years. CATARACT EXTRACTION.-I cannot resist the temptation to dwell first on the operation for cataract, which is, and probably always will be, the operation in ophthalmology. The subject is just as fascinating to the ophthalmologist as the role of Hamlet to the actor. Every surgeon views the subject from his own angle and there are no two clinics that I have seen, where the operation is done by exactly the same technique. A few years ago we in Lund began to adopt an intracapsular operative method, which closely resembles that introduced by the Baltimore school.I would, however, point out that the old extracapsular operation should not yet be rejected or regarded as old-fashioned; on the contrary, it is simpler and involves fewer risks. It seems contradictory to say that one method is more difficult than another and to claim at the same time that the attendant risks are not larger. Anyone who has taught young ophthalmologists how to operate for cataract will be able to confirm this. The intracapsular method is not an easy one for beginners. The question is whether less trained or less skilled surgeons should not be dissuaded from using it. Although I have regularly operated intracapsularly during recent years, I must agree with Ridley (1952), whose boldness cannot be questioned when it comes to trying new surgical methods, when he admits point blank the advantages of the extracapsular methods. On the other hand, I cannot agree with Knapp (1947), when he says at the end of his interesting report on the present status of the intracapsular cataract operation:If you can establish a safe method of intracapsular cataract extraction, you will equal Daviel's contribution to humanity.In my opinion, the intracapsular operation for cataract marks no such revolutionary advance, though I readily admit its advantages when performed by well-trained and experienced surgeons.