A system for estimating and tracking refractive error progression of an individual, comprising: a server, at least one database for storing data from the server, and a computer or smart device (115, 120) in communication with the server via a network and comprising a graphical user interface; wherein the server is configured to: estimate a percentile of Spherical Equivalent Refraction (SPHEQ) as a function of at least the individual's age by modeling population reference percentiles of SPHEQ from a selected dataset, wherein the dataset represents a reference population and comprises Spherical Equivalent Refraction data as a function of age and at least one of country, region, gender, ethnicity, or parental history; receive input data for the individual comprising a baseline SPHEQ of the individual and a baseline age of the individual; estimate an expected Spherical Equivalent Refraction (SPHEQ) trajectory over a predetermined period of time using the input data and a model of SPHEQ as a function of at least baseline age and baseline SPHEQ of the individual that has been fitted to the selected dataset; and estimate an expected SPHEQ trajectory using an ametropia control treatment over the predetermined period of time by comparing the input data to data from a clinically validated ametropia control treatment; and wherein the computer or smart device is configured to display a comparison of the expected SPHEQ trajectory over a predetermined period of time with the expected SPHEQ trajectory over the predetermined period of time using the ametropia control treatment. a server, at least one database for storing data from the server, and a computer or smart device (115, 120) in communication with the server via a network and comprising a graphical user interface; wherein the server is configured to: estimate a percentile of Spherical Equivalent Refraction (SPHEQ) as a function of at least the individual's age by modeling population reference percentiles of SPHEQ from a selected dataset, wherein the dataset represents a reference population and comprises Spherical Equivalent Refraction data as a function of age and at least one of country, region, gender, ethnicity, or parental history; receive input data for the individual comprising a baseline SPHEQ of the individual and a baseline age of the individual; estimate an expected Spherical Equivalent Refraction (SPHEQ) trajectory over a predetermined period of time using the input data and a model of SPHEQ as a function of at least baseline age and baseline SPHEQ of the individual that has been fitted to the selected dataset; and estimate an expected SPHEQ trajectory using an ametropia control treatment over the predetermined period of time by comparing the input data to data from a clinically validated ametropia control treatment; and wherein the computer or smart device is configured to display a comparison of the expected SPHEQ trajectory over a predetermined period of time with the expected SPHEQ trajectory over the predetermined period of time using the ametropia control treatment. estimate a percentile of Spherical Equivalent Refraction (SPHEQ) as a function of at least the individual's age by modeling population reference percentiles of SPHEQ from a selected dataset, wherein the dataset represents a reference population and comprises Spherical Equivalent Refraction data as a function of age and at least one of country, region, gender, ethnicity, or parental history; receive input data for the individual comprising a baseline SPHEQ of the individual and a baseline age of the individual; estimate an expected Spherical Equivalent Refraction (SPHEQ) trajectory over a predetermined period of time using the input data and a model of SPHEQ as a function of at least baseline age and baseline SPHEQ of the individual that has been fitted to the selected dataset; and estimate an expected SPHEQ trajectory using an ametropia control treatment over the predetermined period of time by comparing the input data to data from a clinically validated ametropia control treatment; and wherein the computer or smart device is configured to display a comparison of the expected SPHEQ trajectory over a predetermined period of time with the expected SPHEQ trajectory over the predetermined period of time using the ametropia control treatment.