This may be more of a spiritual problem than a physical one.
Blessed are the Pure in heart for they shall see God. Matthew 5:8
I did a study on the God that hides and came up with these. Once you know he hides it is easier to tell an unbeliever why he cant see God. See Romans 1 19-22 and the Invisible attributes.
Ultimately we are told to Seek Him with all our heart.
Luke 19:42 “If you had known in this day, even you, the things which make for peace! But now they have been hidden from your eyes.”
Matthew 11:25 At that time Jesus said, “I praise You, Father, Lord of heaven and earth, that You have hidden these things from the wise and intelligent and have revealed them to infants.”
Isaiah 45:15 Truly, You are a God who hides Himself, O God of Israel, Savior!
Lamentations 3:44 You have covered Yourself with a cloud So that no prayer can pass through.
Isaiah 59:2 But your iniquities have made a separation between you and your God, And your sins have hidden His face from you so that He does not hear.
Deuteronomy 32:20 “Then He said, ‘I will hide My face from them, I will see what their end shall be; For they are a perverse generation, Sons in whom is no faithfulness.
Deuteronomy 31:18 But I will surely hide My face in that day because of all the evil which they will do, for they will turn to other gods.
Isaiah 1:15 “So when you spread out your hands in prayer, I will hide My eyes from you; Yes, even though you multiply prayers, I will not listen. Your hands are covered with blood.
Psalm 44:24 Why do You hide Your face And forget our affliction and our oppression.
Psalm 10:1 Why do You stand afar off, O Lord? Why do You hide Yourself in times of trouble?
Now, tell me why it was a women to see him first after the resurrection.