Purpose: To determine the difference in the effect of different morphological types of cataract on visual acuity and contrast sensitivity. Methods: 119 eyes were enrolled in this prospective controlled study, of which 99 eyes with early senile cataract and 20 eyes of normal participants as control group. The 99 eyes of early senile cataract were categorized and graded according to the LOCS III with complete ophthalmological examination and were grouped into 3 groups. The first group is 33 with pure cortical cataract, the 2nd group is 33 with pure nuclear cataract and the 3rd group is 33 with posterior sub capsular cataract. Contrast sensitivity function was measured in patients with different cataract types using the F.AC.T chart with the 5 spatial frequencies (1.5, 3, 6, 12, and18) where the mean values at each spatial frequency in each type of cataract was plotted on the recording curve and with the Frequency doubling perimetry depending on its usage of the sine wave gratings while using the Mean deviation and Pattern standard deviation as correlative values, best corrected visual acuity was measured using the Snellen chart and recorded in decimal. Results: Contrast sensitivity function was significantly correlated with the LOCS III scores of Nuclear cataract and Cortical cataract and Posterior subcapsular cataract. Best corrected visual acuity was significantly decreased in Posterior subcapsular cataract followed by Cortical cataract then Nuclear cataract, it was statistically significant when comparing the decline in the Visual acuity in Nuclear cataract versus the decline in Visual acuity in Posterior subcapsular cataract (P-value < 0.001). For Cortical cataract there was a moderate correlation between Best corrected visual acuity and Contrast sensitivity function at lower frequencies (1.5-3 c/d) R=0.56 and P value =0.001, while no correlation at medium (6 c/d) and higher frequencies (12 and 18 c/d).For Nuclear cataract there was no correlation between best corrected visual acuity and Contrast sensitivity function at all the spatial frequencies. For Posterior subcapsular cataract there was a good correlation between Best corrected visual acuity and Contrast sensitivity function at lower frequencies R=0.7and p value=0.001, while there is moderate correlation at medium frequencies R=0.45and P value=0.008 and moderate to weak correlation at higher frequencies (12&18) R=0.38 to 0.50 and P value (0.002 to 0.003). Best corrected visual acuity of the 99 participants was divided into two groups:1st group (0.2,0.3) and 2ndgroup(0.5,0.67,1.0) ,and the median values of the Contrast sensitivity was calculated in each group at the five spatial frequencies(1.5,3,6,12,18) in each type of cataract .Results were that in the 1st group the median values of Cortical cataract were markedly decreased in low spatial frequencies(1.5, 3), while those of Posterior subcapular cataract were markedly decreased at higher spatial frequencies(6,12,18).And in the 2nd group there was the same results. Conclusion: The loss of low-frequency Contrast sensitivity (1.5 and 3c/d) was more prominent in age-related Cortical cataract patients, while the loss of high frequency Contrast sensitivity (12 and 18) was more prominent in age-related Posterior subcapular cataract.