I dont think a corrective lense will stop you from getting a pilots license, but color blindness will surely stop you from dreaming. If you haven't done an Eye test that includes a color blindness test, better do so. PAL Av is basically strict on the initial requirements, of course they want you to come in clean, specially you're coming in as a Cadet(the paying cadet...) You can try other Flying schools, as I remember I have a friend flying for Cebu Pacific whom had since started his flying lessons has been wearing glasses(not even a corrective lense) until now. So, there are ways. You just need to find the easiest for you. Goodluck !