Electrical component maker E2V fell Thursday as it said sales since the start of the financial year are down on last year, with the medical business finding it tough.It added that trading remains challenging and it is talking to its financial advisors about the "most appropriate long term capital structure" for the company.Retinal imaging company Optos gained on news that it has continued to trade in line with expectations for the full year. Restructuring is complete and the group said it has delivered overhead reductions at the top end of its 10-20% target range. "Optos is making good progress in the current challenging environment and we remain firmly on track to achieve our targets for the full year," said the group.FTSE TechMARK - FallersE2V Technologies (E2V) 50.00p -13.79%Torotrak (TRK) 23.00p -5.15%Biocompatibles International (BII) 178.00p -3.78%Phytopharm (PYM) 4.65p -3.73%Oxford Instruments (OXIG) 157.00p -3.68%RM Group (RM.) 164.00p -2.81%Axis-Shield (ASD) 332.50p -2.78%Puricore (PURI) 19.50p -2.50%Microgen (MCGN) 67.00p -2.19%ProStrakan (PSK) 106.00p -1.85%FTSE TechMARK - RisersTurbo Power Systems (TPS) 2.33p +9.41%Optos (OPTS) 74.50p +8.36%Elan Corporation (ELA) ⬠5.59 +2.85%Phoenix IT Group (PNX) 236.00p +2.16%Imagination Technologies (IMG) 167.00p +1.83%Gresham Computing (GHT) 46.00p +1.66%Wolfson Microelectronics (WLF) 124.00p +1.22%Innovation Group (TIG) 9.85p +0.92%