If a child has astigm of 0.75 and myopia of 0.5 on both eyes , similar reading , does that warrant the use of spectacle ?

I think it will be good to get a pair of spectacles and use them when needed. The readings seemed low (though I'm not an expert) so I think the spectacles could be worn only when needed (e.g., if child has difficulty making out the words written on the board). Can check with the optician for his/her professional advice when you bring your child for a checkup or to make the glasses.

Thank you for your question! With a low power such as yours, you would perhaps be prescribed low power reading glasses. It would be best to go to a eyecare professional for you to get your eyes checked, and for your eyecare professional to give you a recommendation based on his/her examination of your eyes.