Your contrast sensitivity function essentially is a plotting of the curve that defines the lowest contrast level that you can detect for each spatial frequency tested.
Generally, objects with high spatial frequencies (sine-wave gratings with very thin bars) must have significantly higher contrast than objects with lower spatial frequencies (gratings with medium-width bars) to be detected by the human visual system.
The only way to know for sure that you have normal contrast sensitivity is to see an eye doctor.

Price:
Price 95000 INR / Piece
Minimum Order Quantity : 1 Piece
Portable : Yes
Usage : HOSPITAL ,CLINIC
Condition : New
Material : Plastic,silicon
Price 36000.0 INR / Piece
Minimum Order Quantity : 1 Piece
Portable : Yes
Usage : HOSPITAL ,CLINIC
Condition : New
Material : Metal
Price 32000 INR / Piece
Minimum Order Quantity : 1 Piece
Portable : Yes
Usage : Hospital and clinic
Condition : New
Price 200 INR / Piece
Minimum Order Quantity : 500 Pieces
Portable : Yes
Usage : Hospital
Condition : New
Material : Plastic