Telescope lens problem when cold
Dew-heater bands (straps) do come in sizes even down to 1.25&quot; and 2&quot; eyepiece. Multiple vendors make these.  Dew-straps are something of a standard in that they are resistive heat-straps designed to run on roughly 12v power.  The typically use the (RCA) tuplip type plug.  The dew-strap and dew-controller typically do not need to be made by the same vendor to be compatible.
Check vendors such as AstroZap, Dew-Not, Kendrick Astro Products, and others.
Depending on your dew controller, you may need a controller with additional channels.  Multi-channel dew-controllers allow you to set different power levels for each channel (or at least for groups) since the amount of power needed to heat, say, the corrector plate on a large telescope is much more than the power needed to heat a tiny 1.25&quot; eyepiece.
If you have adequate power, you can use a hair-dryer to defrost an eyepiece (although I prefer the dew-heater strap to prevent fogging.)