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Might be worth having a look at these options T-Bar - coloured bar which can be dragged around over any window to provide filtering. Colour and transparency can be altered to suit ssOverlay - colour cast over the whole screen, colour and transparency can be altered to suit. RapidSet - simple global colour changer as per ScreenTinter Vu-Bar - on screen slotted ruler similar to the physical rulers used by some dyslexic children. Washer - converts everything below the application to grey scale All these apps are available from Fx Free Software & Assistive Software, download site for VuBar, TBar, Edgeless & other applications on the Assistive page. many other useful apps there as well

Started off in BASIC, then moved on to Z80 machine code, then to C on UNIX systems, followed by Visual Basic, Visual Dialogscript, Pascal, Delphi, HTML, Javascript, CSS, VBA and on and on