The first picture his eyes look normal.
The second and forth pic I cant tell anything.
The third pic looks like his left eye is bulging out and cloudy.
Are the eyes cloudy?
Do you have a picture of him when you first got him?
If you do, compare the latest pics to the first pic you took of him.
Most eye problems are caused by poor water quality and a dirty environment. If the water quality is good (0 ammonia, 0 nitrite, and less than 20ppm nitrate), and you do regular water changes and gravel cleaning, eye problems are very rare and usually heal up quickly.
You can do a 75% water change and gravel clean the substrate every day for 2 weeks and that will usually heal most eye problems. If they are actually swollen and don't improve after a couple of big water changes, then you might need anti-biotics. But at this stage I would do water changes and gravel cleans first and see how he looks in a few days.
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Melafix, Pimafix and Bettafix all contain the same thing (tea tree oil). This can leave a film on the surface that prevents the fish being able to breath air from the atmosphere. You should only use these products if you have lots of aeration/ surface turbulence and a filter on the tank.