While peripheral Estonian dialects are characterized by various degrees of vowel harmony, central dialects have almost completely lost the feature. Since the standard language is based on central dialects, it has no vowel harmony either. In the standard language, the front vowels occur exclusively on the first or stressed syllable, although vowel harmony is still apparent in older texts.Prillop, Külli et al. 2020. Eesti keele ajalugu. Tartu Ülikooli Kirjastus. p. 133.
while peripheral estonian dialects are characterized by various degrees of vowel harmony central dialects have almost completely lost the feature since the standard language is based on central dialects it has no vowel harmony either in the standard language the front vowels occur exclusively on the first or stressed syllable although vowel harmony is still apparent in older textsprillop külli et al 2020 eesti keele ajalugu tartu ülikooli kirjastus p 133