It has been assumed that the ciliary muscle in an infant is underdeveloped, which is why they can't focus. Lessans disputes this explanation. Every other sense is in full working order.
Is it? Are you sure? Do infants generally like the same foods as adults? Why does baby food taste so awful and bland to an adult?
Could it be that the claim that babies are born with fully developed senses of taste, smell, touch and hearing is in fact false?
Have you ever thought about that? Or tested it? Most parents know what baby food tastes like, and most agree that it's not very nice - but if you try spicing it up, to make it taste good to you, baby won't eat it.
The things we believe are often easy to test, but sadly many people would rather believe than know, where knowing carries the risk that our deep rooted faith - in our parents, our priests, and our scriptures - might be shown to be unjustified.
The first time we find out that our dads were wrong about something can be a traumatic event in our lives. But it's a necessary part of our journey to adulthood.
In a very real sense, those who respond to the discovery that their parents are fallible with
denial can never become adults, and doom themselves to a life of infantile gullibility, and useless parasitism on adult society.
Your dad was human, and consequently made a LOT of mistakes, as do we all. Acceptance of this obvious and inevitable truth is the first necessary step towards becoming a grownup - and that's a step that you have delayed for far too long.