Holes in absorption spectra have been measured for chlorin dopant educt and photoproduct states in several molecular and polymeric glasses. In contrast to the well-known picture of zero-phonon holes and phonon sideholes observable in educt state, no zero-phonon hole is observable in the photoproduct state in glasses, yet the absorption spectra exhibit a peculiarity resonant with the burning frequency (‘A-spectra’). The low-temperature vibronic spectra of an impurity in 1D elastic lattice have been calculated for free and anchored lattices. Calculated spectra match qualitatively well the experimental observations. The 1D models are discussed in view of structural models of glasses assuming existence of 1D inherent structural defects (disclinations). Applicability of Frenkel- Kontorova model (FKM) as a generalisation of 1D lattice models to the dynamics of molecules in the core region of disclinations is discussed. Possible connection of the experimental findings to the transition by breaking of analyticity in FKM is analysed.