By Charles 
A dining chair is ergonomic if it supports a natural seated posture, fits the table height, and lets the user sit, eat, and get up without strain. It does not need to look like an office chair, but the proportions should work with the body.
First check seat height. Most dining chairs work with standard dining tables when the seat allows feet to rest on the floor and leaves comfortable space between thighs and the tabletop. If the chair is too high, shoulders may rise while eating. If it is too low, the user may hunch forward.
Next look at seat depth and width. The seat should support the thighs without pressing behind the knees. It should also be wide enough for comfortable movement without taking too much space around the table. A slightly contoured or padded seat can improve comfort, but overly deep or soft seats may not suit everyone.
The backrest should support the lower and mid back in a relaxed upright position. A gentle angle is often more comfortable than a perfectly vertical back, but the chair should still keep the diner close to the table. Armrests can help some users, though they must fit the table and room.
For POVISON, compare dining chairs by seat height, back shape, arm design, and cushion type. Ergonomic comfort is best judged by matching chair dimensions to both the table and the main users.
