Did any spelling changes occur in order to form this word monocular?

Yes, the Word "monocular" is derived from the Latin root "monoculus," meaning "one eye." The spelling changed as it transitioned from Latin to English, where the suffix "-ar" was added to create the adjective form. Additionally, the prefix "mono-" reflects the Greek Word for "one," which remained consistent throughout the transformation. Thus, while there were modifications, the core components retained their original forms.