different between protoreceptor vs photoreceptor

protoreceptor

protoreceptor From the web:

• what photoreceptors are responsible for color vision
• what photoreceptor detects color
• what photoreceptors are involved in acuity
• what photoreceptors are in charge in seeing in the dark
• what photoreceptors cause color blindness
• what photoreceptor produces colour vision
• what photoreceptors are found in the fovea centralis
• photoreceptor meaning

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photoreceptor

photoreceptor From the web:

• what photoreceptors are responsible for color vision
• what photoreceptor detects color
• what photoreceptors are involved in acuity
• what photoreceptors are in charge in seeing in the dark
• what photoreceptors cause color blindness
• what photoreceptor produces colour vision
• which type of photoreceptors are involved in color vision
• which is responsible for color vision