Your left eye has become amblyopic(lazy eye)&has led to development of squint, there is less or no vision in left eye,if it has been diagnosed in in childhood below 10-12 yrs of age , Vision of left eye could have been restored to normal by pleoptic treatment which is not possible at this age
Next Steps
Now you should know that after squint surgery in lazy eye ,it again resume the same position (Squinting)in 5 to 10yrs(anatomical position). If in childhood squint surgery could have been done after pleoptic treatment ,you could not have developed Squint again & would have developed binocular vision which is must in most of government 's job .You take care of your child, some times it manifests in next generation, so get your child checked up before 8 yrs so that it's proper management can be done at proper age.
Health Tips
You can go for cosmetic correction but it will not be long lasting, with regards Dr Arjun kr Singh.