Answer:
Yes.
Probability of such child = 1/2 or 50%
Explanation:
According to the question, below are the genotypes and phenotypes possibilities:
aa = normal vision & no headache
Aa = normal vision & no headache
AA = blindness & headache
                                                                       Male                       Female
                                                                         Aa                            aa
Possible genotypes of progeny:            Aa        Aa           aa         aa
So it is clear that out of the 4 probable children, 2 with 'genotype aa' will have normal vision & no headache.
Mathematical expression is as under:
 2/4 = 1/2 that means 50% progeny. 
 
        
             
        
        
        
The triangle is an Acute angle triangle.
        
             
        
        
        
we use the model to learn about how to create new things
 
        
                    
             
        
        
        
Not really some take faster time