I see many posts here on how to merge cubes, but I think my problem is a little more complex.
I'm very new to blender and am trying to create a model of the human lens. The front and rear surfaces have different radii of curvatures. This is no problem and I used to sphere meshes with the correct radii, and then cut them using the bisect tool the model shown here is a reasonably accurate staring point:
I am now trying to merge the two models. Because the spheres are not bisected along their equator, you can see that both "halves" end with a sharp edge. In the human lens there is, of course no such sharp demarcation between the two parts of the lens - it is a smooth curve.
That is my question - how do I smoothly merge the two parts of the lens model while making it look "organic"?