Disclosed is a material for use in ophthalmologic organ replacement, which is transparent, has controllable physical properties, and can have physical properties suitable for use as an ophthalmic tissue when the hardness of a gel produced from the material or the fluidability of a sol produced from the material at a specific temperature or lower is varied. Specifically disclosed is an ophthalmologic composition capable of forming a gel, which comprises a polyethylene glycol that is represented by formula 1 and has one end modified with a long-chain alkyl group, a polyethylene glycol that is represented by formula 2 and has both ends modified with a long-chain alkyl group, and a solvent.R1—(CH2CH2O-)n1-R2 (Formula 1)[In formula 1, R1 represents an alkyl group having 1 to 4 carbon atoms R2 represents an alkyl group having 16 to 22 carbon atoms and n1 represents the average number of moles of added oxyethylene groups and falls within the range from 45 to 450.]R3—O—(—CH2CH2O-)n2-R4 (Formula 2)[In formula 2, R3 and R4 independently represents an alkyl group having 16 to 22 carbon atoms and n2 represents average number of moles of added oxyethylene groups and falls within the range from 45 to 450.]
