As we know that variation exists between dimensions and morphology of cornea in different strains of mice. Even the susceptibility and resistance to some group of pathogens has been observed (eg. C57BL/6 susceptible to Pseudomonas aeruginosa and resistant to Staphylococcus aureus etc.). Considering different factors (corneal diameter, thickness, cost effectiveness and handling etc) which mice strain do you prefer for studying Keratitis?